All Abrahamic religions believe in the return of the savior, the liberator of the human beings and redeemer, in the End-Time. Prophets and divine messengers have promised the day that the whole universe will be full of justice and tenderness. Other religions also have similar beliefs, although they differ in some minor aspects, which will be discussed below. We go through references from different religions and faiths to examine their views about the last savior. 

Kalki: The Last Savior in Hinduism

In Upanishads, which is a collection of ancient Sanskrit texts that contain some of the central philosophical concepts and ideas of Hinduism, the last savior is called Kalki. He is believed to be the tenth avatar of Hindu god Vishnu in the last of the four stages in the endless cycle of existence known as "Samsara," which is defined "as the endless cycle of birth, death, and rebirth. Or as the world of suffering and dissatisfaction (dukkha)" [1].  He rides a white horse with a fiery sword. He will end the darkest and destructive period to remove adharma [i] and will usher in the Satya Yuga [ii][2]. 

Another reference talks about a just commander at the end-time who is the leader of angels and humans, who knows the truth and gets hold of everything from deep in the seas too high in the mountains, and no one greater than him will come to earth [3].

Saoshyant: The Eschatological Savior in Zoroastrianism

In Zoroastrianism, there are three saviors who each will rise in a thousand years. The last one is an eschatological savior figure who will destroy evil and will bring about the renovation of the world. He is called Saoshyant, which means the beneficent in its single form. Yet, in its plural form, it is considered to mean the redeemer. The Khorda Avesta describes this savior as such:

Whose name will be the victorious SAOSHYANT and whose name will be Astvat-ereta. He will be SAOSHYANT (the Beneficent One) because he will benefit the whole bodily world; he will be ASTVAT-ERETA (he who makes the bodily creatures rise up), because as a bodily creature and as a living creature he will stand against the destruction of the bodily creatures, to withstand the Druj of the two-footed brood, to withstand the evil done by the faithful. [4]
Accordingly, the Soashyant will rise at the end-time and fight against the vices in the world and spread justice and goodness far and wide. 

Maitreya: The Future Buddha

In some of the Buddhist references, such as the Amitabha Sutra and the Lotus Sutra, we read about the future Buddha of this world, called Maitreya, who will be a successor to the present Buddha. In Sanskrit, Maitreya means kindness and love. According to Buddhist religious texts, Maitreya will be the fifth and last Buddha who will appear on the earth. The arrival of Maitreya is expected at a time in the future when the dharma will have been forgotten by most on the earth. That is when Maitreya will appear on the earth to achieve complete enlightenment and to teach the pure dharma [5].

Li Hong: The Last Savior in Taoism

The Taoist last savior, called Li Hong, is depicted as an ideal leader who would reappear to set right heaven (tian) and earth (dì) at a time of upheaval and chaos. Li Hong will appear at the end of the world cycle to rescue the chosen people, who would be distinguished by certain talismans, practices, and virtues [6].

Savior in Abrahamic Religions

Moshiach: The Last Savior in Judaism

The Jews belief in the savior is manifested in the idea of the coming of Moshiach (i.e., Messiah). This person is believed to be a descendant of King David, who will "gather the Jews from all over the world and bring them back to the land of Israel" [7]. There are many verses in different scriptures and Talmudic [iii] literature which refer to this figure and enumerate his characteristics and manners [iv]. For instance, Isaiah says:

And there shall come forth a rod from the stock of Jesse [King David's father], and a branch shall grow from his roots; and the spirit of the Lord shall rest upon him, the spirit of wisdom and understanding, the spirit of counsel and might, the spirit of knowledge and of the fear of the Lord. And his delight shall be in fear of the Lord; and he shall not judge by what his eyes see, nor decide by what his ears hear. But with righteousness shall he judge the poor, and decide with equity for the humble of the earth; and he shall strike the earth with the rod of his mouth, and with the breath of his lips shall he slay the wicked.
–Isaiah 11:1-4

Those who follow Judaism believe that their savior has not been born yet. Therefore, they are eagerly awaiting the coming of the one who will save them and establish a just dominion in which "there will be world peace, no more wars nor famine, and, in general, a high standard of living" [7]. 

The Messiah: Jesus Christ (PBUH) the Savior of Mankind 

Christians believe that Jesus Christ (PBUH) is himself the savior of humankind, and he was born for this purpose. The name Christ literally means "the anointed one" or the Messiah [8]. As the Gospel of Matthew says, Jesus Christ (PBUH) has been sent to "Save his people from their sins" (1:20-21). It is also believed that Jesus Christ (PBUH) had been crucified to atone the sins of humanity and lead them toward salvation. According to Christian sources, Jesus Christ (PBUH) was the savior who was awaited by the Jews as whose coming was predicted in the Torah as the Moshiach. 

Another point which makes Jesus Christ (PBUH) the awaited savior in Christianity is the idea of his second coming or the Second Advent in the end-time to whose "day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father" (Mark 13:32). This is the belief in "the future return of Christ in glory when it is understood that he will set up his kingdom, judge his enemies, and reward the faithful, living and dead" [9]. Different gospels, including Matthew chapters 24–25; Mark, chapter 13; Luke, chapter 21:5–26, and John, chapter 14:25–29, are mentioned as the evidence for this belief. Moreover, according to biblical verses, there will be many signs indicating the end-time among which the second coming of Jesus Christ (PBUH) and the last judgment. 

Therefore, like many other religions, Christians also believe in a savior or as they call it the Messiah, who will make this world a better place and free it from oppression and injustice. 

Imam Mahdi (AS): The Awaited Savior in Islam

In Islam, the belief in the savior is rooted in the fact that Allah never leaves His creatures, especially human beings, on their own and support them through sending His apostles to guide them toward the right path: "and there is a guide for every people" Quran (13:7). He had sent 124000 prophets (PBUT) first, followed by righteous leaders who continued the path of previously chosen messengers of Allah. As the Quran says, "Certainly We wrote in the Psalms, after the Torah: 'Indeed My righteous servants shall inherit the earth.'" (21:105).

 Therefore, the earth will never become empty of Allah's guide, and people will benefit from these guiding lights either directly or indirectly. Imam Mahdi (AS), the twelfth leader of Muslims and a descendant of Prophet Muhammad (PBUH&HP), who is leading a secret life at the time, will ultimately rise and spread peace and humanity throughout the earth. "The Holy Prophet (PBUH&HP) informed Muslims about his reappearance, telling his names, attributes, appellations, and peculiarities" [10]. The time of his coming is unknown, and it is followed by the preparation of particular circumstances. 

The signs that indicate his coming include "Widespread injustice and oppression, the advent of Dajjal (Anti-Christ) who would misguide the thinking of the people, the advent of Sufyani who is one of the pillars of mischief and corruption on the earth, the formation of the Islamic army, which would raise up black standards, the voice of the angel of the sky giving glad-tidings of his reappearance, the coming down on earth of Jesus Christ (PBUH) and his paying allegiance to and praying behind in congregation Prayers led by Imam Mahdi (AS)" [11]

This belief in the last savior, who would stand against tyranny and injustice and remind human beings of their real value, also, highlights Islam's optimism toward the future of the world.

Finally, we have reviewed the belief in the last savior or the person who will save humankind from the evilness and destruction in this world in different faiths and religions. On a more in-depth look, we can find many similarities between these beliefs. However, the Abrahamic religions had a more precise and more tangible attitude toward the idea of the last savior and the time of his coming. Therefore, the concept of the savior is one of the most essential and significant matters regarding the future of human destiny. 

Notes:
[i] Opposite to dharma, which includes unnaturalness, wrongness, evil, immorality, wickedness, and vice. 
[ii] The period when humanity will be governed by gods and every manifestation or work is close to the purest ideal, and humanity will allow intrinsic goodness to rule supreme.
[iii] The central text of Judaism and the primary source of the Jewish religion. 
[iv] Isaiah 2, 11, 42; 59:20, Jeremiah 23, 30, 33; 48:47; 49:39, Ezekiel 38:16, Hosea 3:4-3:5, Micah 4, Zephaniah 3:9, Zechariah 14:9, Daniel 10:14. 

References:

1. Samsara
2. the man on the white horse
3. The Vishnu Purana, trans. Horace Hayman Wilson, London: Trübner & co., Book IV, Chapter 24.
4. Khorda Avesta, Translated by James Darmesteter (From Sacred Books of the East, American Edition, 1898.), Part five
5. Buddhism
6. Anna K. Seidel. "Perfect Ruler in Early Taoist Messianism: Lao-tzu and Li Hung." History of Religions, Vol. 9, No. 2/3
7. The end of days
8. what does christ mean
9. second coming
10. Sayyid Ali al-Husayni al-Milani, The Promised Savior: An inquiry into the imamate of Imam Mahdi (as) from the viewpoint of Muslim thinkers, part 1, p.8. 
11. Baqir Shareef al-Qurashi, The Life of Imam al-Mahdi, Trans. Sayyid Athar Husayn S.H. Rizvi, p.259-283. Pdf. 

If you have ever experienced such hard conditions in life that you see your life or other peoples’ lives completely purposeless or absolutely miserable and you may have thought of killing yourself or ending miserable peoples’ lives, then I suggest you read this text to the end and realize why suicide in Islam is strictly forbidden. 

Although I know that if you are close to one of those highly hopeless phases of your life, you may even wish to kill me over the net!!! But, you probably have no important task right now, as you probably don’t care. So read on and do not lose your opportunity of accompanying me in this meaningless life!

Why Thinking of Suicide?

Have you ever come across a person who is seriously ill, and his existence seems to be real trouble for himself and his family members? He stays all day in bed, with no capability of moving, or talking or transferring emotions or anything else, and he lives a plant life. Have you ever thought that killing such a useless and incapable person would bring more mental, physical and economic benefits to the society? 

These thoughts and many other thoughts that may be on your mind, and may have remained unanswered for ages, can make life meaningless. But let us see how our creator answers these types of thoughts; 

1. Why Am I not in the Situation that I Want to Be?

All human beings try to reach high positions in life, whether economic, social, political, educational, physical or spiritual. Some people reach those high positions, and many of them remain normal people in society. Among those who think that they have not achieved such reasonable positions in life, there is a group who has never set a real goal to achieve and have only dreamt of those situations.

But there are also a group of people who have set realistic goals and tried hard to achieve them, but they have never been successful. A percentage of the latter group may become disappointed and may think of this life as a pointless life, and some of them may think of suicide.  

2. Why Can I not Be with the Person I Really Love?

The tragedy that repeats in the history of humankind, and has been the reason for many suicide attempts is a broken heart, and not gaining the love of your life. People, who are not in love, may think that the suicidal decisions of disappointed lovers are very shallow and childish. But the person, who is trapped in the hands of powerful love, sees nothing more important than reaching the love of his/ her life. 

The worldly loves may not be limited to the opposite sex only. Some people desire wealth, different jobs, cars, buildings, and towers, or even knowledge. This sort of love can also remain unattained and lead people toward disappointment. 

3. What Is the Point of Living in Such a Depressing Life?

Some people face problems in every aspect of their life. It can be individual problems such as debt, disease, family problems, loneliness, etc. Or it could be much bigger than that; social problems, war, the unjust power of imperialism and capitalism, environmental pollutions or the spread of oppression in the world.

These great issues are enough to make one totally disillusioned with living in this cruel world and to lead him toward ending his/ her life.

What Is God’s Answer to Pseudo Injustice and Corruption?

In all the issues mentioned above, that may take a person to the point of hopelessness, God gives us guidelines and answers. He says in the Holy Quran that most of the hardship that human beings go through is to test their level of faith and to distinguish those who are truthful and those who verbally talk about faith with no real belief in it (29: 2-3).

The life of this world is only a place for us to prove our capabilities and talents for greater eternal life, and in this path, only the patient will win; 

“We will surely test you with a measure of fear and hunger and a loss of wealth, lives, and fruits; and give good news to the patient.” (2: 155)

Do You Kill Yourself in the Middle of a Test?

Imagine that you have entered a challenge or a test. In the middle of the tackle, you find it really hard that you feel like you cannot take it anymore. Will you stop the challenge and decide to kill yourself, or will you think about your goals and keep going with the rest of your energy?  

Usually, people who have set goals in life, will keep moving and find ways of overcoming problems. Therefore, the main problem of those who may think of suicide is that they don’t have a clear goal, nor they have a clear vision of the meaning of challenges in life. 

From an Islamic viewpoint, the life of this world is full of different tests, and by going through them and passing the tests, people elevate their spiritual level and build their eternal life more comfortable. Therefore, the harder the tests are, the stronger the person will become, and he will have an easier life in the hereafter.

How Does God Want Us to Face Our Problems? and Why Suicide in Islam Is Forbidden?

First of all, He wants us to choose the right path in life; “rectitude has become distinct from error.” (2: 256)

After choosing the path of righteousness, He wants us to follow the guidelines that He sent us through His messengers; “should any guidance come to you from Me, those who follow My guidance will not go astray, nor will they be miserable.” (20: 123)

Then, He promises that whoever sets his goals in the direction of helping the religion of God and gaining God’s satisfaction, He will show him/her the right way: “As for those who strive in Us, We shall surely guide them in Our ways, and Allah is indeed with the virtuous.”(29:69)

Therefore, whoever forms his lifestyle based on teachings of God, will never feel disappointed, since Allah says: “indeed no one despairs of Allah’s mercy except the faithless lot”. (12: 87)

Conclusion

When you face problems you should:

1. Revise your goals and lifestyle. If it is against the path that Allah has sent us, disappointment will overcome you at some points. 

2. Remember God, knowing that it will give you strength; “—those who have faith and whose hearts find rest in the remembrance of Allah.’ Behold! The hearts find rest in Allah’s remembrance!” (13: 28)

3. Form a strong Islamic family to keep you in peace; “And of His signs is that He created for you mates from your own selves that you may take comfort in them, and He ordained affection and mercy between you.” (30:21)

4. Never hang around aimlessly and idly; “so when you are done appoint (to a new task).” (94: 7)

5. Keep in mind that the real life is to come after death. So live every day of your life knowing that it may be your last day. Many of us are the last minute people!!

And there are many other solutions that can help us get rid of satanic thoughts, if we just read the Quran while we are depressed and feeling suicidal.