Christianity and Islam are the two largest religions in the world, with many apparent similarities between their beliefs. However, there is a crucial difference among some sects of Christianity and Islam, which is the question of the divinity of Prophet Jesus (PBUH). Christianity is usually regarded as a Monotheistic religion, some of its denominations, though, hold that Jesus (PBUH) is a part of Trinity and is God. But Muslims believe Jesus (PBUH) is a human being. They love prophet Jesus (PBUH) and honor him as one of the greatest prophets, yet for them, Jesus (PBUH) is not God nor the son of God. 

Here are some common reasons why Muslims do Not believe in Jesus Christ (PBUH) as God or the son of God:

1. “Nothing is like Him” (42:11)

According to the verses of the Quran and what Muslims believe, God is One and unique in essence, attributes and actions, and is not like any of His creatures. So having a child, which is the reproduction of a similar one, is impossible for Him. “The originator of the heavens and the earth—how could He have a child when He has had no spouse? He created all things, and He has knowledge of all things” (6:101).

2. “The sights do not apprehend Him” (6:103)

From the Islamic perspective, it doesn’t make any sense to consider human form for Allah. This is also acknowledged in the bible as Jesus (PBUH) said once when he was among his followers: “You have never heard His voice at any time nor seen His form” John (5:37).

Muslims believe Jesus (PBUH) was created just as Adam (PBUH) was created without a father. And that his life as a human began miraculously by Allah just as He created Adam (PBUH) the first time. If Jesus Christ (PBUH) was God, then how could he be born of his mother, Saint Mary? Or how could he die in the hands of humans? Also, if God could take human form, wouldn’t there need to be another God to run the universe? These ideas are explicitly rejected in the holy Quran: “There is no god but Allah, and indeed Allah is the All-mighty, the All-wise” (3:62)

3. “Allah is the All-sufficient” (35:15)

We, human beings, need to have children for various reasons. We would satisfy many of our desires, having them, like our sensual or emotional needs. Some of us might want to have one to assist us with our works and needs. Some might seek a name after death, etc. None of these, however, would make any sense about Allah, who is the Creator of the universe, the All-mighty and the All-sufficient: “O mankind! You are the ones who stand in need of Allah, and Allah—He is the All-sufficient” (35:15).

4. “The Messiah [Jesus Christ], son of Mary, is but an apostle” (5:75)

The other reason that proves Jesus Christ (PBUH) is not God or the son of Him is that he was a human being with all human attributes and requirements. He was in his mother’s womb for some time; he was born; he would eat, drink and sleep and was nothing different from all other human beings except that he was the messenger of Allah: “The Messiah, son of Mary, is but an apostle. Certainly, [other] apostles have passed before him, and his mother was a truthful one. Both of them would eat food. Look how We clarify the signs for them, and yet, look, how they go astray!” (5:75).

More importantly, Jesus Christ (PBUH) himself never claimed that he is a God and has to be worshipped. In fact, he said the contrary in Mathew (15:9): “They worship me in vain; their teachings are merely human rules.” Or, in Numbers (23:19), he said: “God is not man… or a son of man”. In many other verses, he admitted that he was only an apostle of God, not God, nor the son of Him, and there is only one true God: “Now this is eternal life, that they may know You, the only TRUE God, and Jesus Christ, whom You have sent” John (17:3).

You see, there are serious contradictions and misconceptions between different verses of the New Testament and also what Christians believe about Prophet Jesus (PBUH). But what the holy Quran suggests is clear: “Say, ‘He is Allah, the One. Allah is the All-embracing. He neither begat, nor was begotten, nor has He any equal.’” (112:1-4) And that Jesus (PBUH) was a prophet, born without a father, just as Adam and Eve were born without parents. Miracles were given to him by Allah to convince people that Allah, the only true God exists.

References:

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1. The Taste of Water

The taste of water is the taste of life. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.49, p.99.

2. Cleanliness

Cleanliness is among the manners of prophets. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.78, p.335.

3. Halal Food

Any food that benefits the body and brings energy to it is allowed (Halal), and whatever harms the body and drains its energy is forbidden (Haram).

Baqir Sharif al-Qurashi, Al-Fiqh al-Radawi, p.254. 

4. A Plan for Life according to Imam Rida (AS)

Try to divide your day into four parts; a part for praying to Allah, one for providing your livelihood, one for spending time with your friends and the ones you trust to tell your mistakes and love you sincerely, and a part for enjoying Halal pleasures which gives you the ability to fulfill the other parts.

Baqir Sharif al-Qurashi, Al-Fiqh al-Radawi, p.337.

 5. This World and the Hereafter

The one who puts aside his/her world [ultimately] for the sake of his/her religion, or vice versa, is not among our followers. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.78, p.346.

6. Manners

Observe your manners in your relations with the ones older or younger than you. 

Mirza Husayn Nuri, Mustadrak al-wasa'il, vol.8, p.354. 

7. A Believer's Grief

Whoever washes away a believer's grief, Allah will save him/her from despair on the Day of Judgment.

Muhammad ibn Ya'qub al-Kulayni,  al-Kafi, vol.2, p.200.

8. Gratitude 

Allah has commanded to express gratitude toward Himself and your parents; therefore, if you don't give thanks to your parents, you are not grateful to Allah.

Al-Shaykh al-Saduq, Al-Khisal, p.156.

9. Reason and Ignorance

Reason is your best friend and ignorance, your worst enemy.

Ibn Shu’bah, Tuhaf al-Uqul, p.443. 

10. Make Attempts

You are ridiculing yourself if you ask for Allah's help, yet don't make any attempts [to reach your goal]. 

Muhammadi Reyshahri, Mizan al-Hikmah, hadith no.2790.

11. Greetings

The one who greets a poor Muslim differently than a rich person will face Allah's wrath on the Day of Judgement.  

Al-Shaykh al-Saduq, Uyoun Akhbar Al-Ridha, vol.2, p.59. 

12. Generosity

From the two groups who face each other, victory belongs to the one that shows more generosity. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.71, p.452.

13. Modesty in Imam Rida (AS)'s View

Modesty has different manifestations; one is for those who know their limitations, accept their position contently, like to treat people the way they expect to be treated, confront insult with benevolence, control their anger and forgive people. Allah loves the righteous. 

Muhammad ibn Ya'qub al-Kulayni,  al-Kafi, vol.2, p.124.

14. Optimism 

Allah will treat the one who holds an optimistic view toward Him, the same as his/her approach. 

Muhammad ibn Ya'qub al-Kulayni,  al-Kafi, vol.8, p.347.

15. Eating Less

Eating less and refraining from excessive use of food will protect your body against various diseases.

Al-Ma’mun ,al-Risa’la al-Dhahabiya fi al-Tibb, p.270. 

16. Sickness and Health

Two groups are always sick; A healthy person who abstains from food and a sick person who does not abstain.  

Baqir Sharif al-Qurashi, Al-Fiqh al-Radawi, p.340.

17. Respect Allah

Whoever respects Allah's sanctuary, he/she will be respected, and whoever obeys Allah, will be obeyed. 

Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.1, p.137.

18. A Generous Person

A generous person eats from other people's food [if invited], for people to eat from his/hers, and the ungenerous does not eat from other's food, to not offer his/her own food to others. 

Al-Shaykh al-Saduq, Uyoun Akhbar Al-Ridha, vol.1, p.15. 

19. Children and the Elderly

Respect the elderly, be kind to children, and pay a visit to your relatives.

Al-Shaykh al-Saduq, Uyoun Akhbar Al-Ridha, vol.2, p.265.

20. Praying to Allah

Allah delays granting the request of a believer, since He is eager to listen to him/her praying, saying, "This is the voice I love listening to" and hasten in granting the request of a hypocrite, saying, "This is the voice I loathe hearing." 

Baqir Sharif al-Qurashi, Al-Fiqh al-Radawi, p.345.

21. Know Your Value

Whoever knows his/her value will never be devastated.

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.72, p.66.

22. Eid al-Fitr as Imam Rida (AS) Describes

Fitr has been appointed as Eid for Muslims to come together as a community on this day in the presence of the Lord and thank Him for His blessings.

Ibn Qūlawayh, Kamil al-Ziyarat, p.522.

23. Visiting Relatives and Friends 

Visit each other regularly to create more love between yourselves, and hold each other's hands and wipe anger away from your hearts.

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.78, p.347.

24. The Manner of Borrowing

The one who borrows something with the intention of giving it back is under Allah's protection until he does so. However, if he doesn't have the intention of paying the debt back to its owner, he is considered a thief.

Baqir Sharif al-Qurashi, Al-Fiqh al-Radawi, p.268.

25. Signs of Awareness in Imam Rida (AS)'s Words

Patience, knowledge, and silence are signs of awareness. Silence is one of the gates to wisdom. It endows human beings with tenderness and guides them toward virtues. 

Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.113.

26. Perfume

Wearing perfume is one of the manners of prophets.

Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.6, p.510.

27. Repenting

The one who repents from sin and repeats doing it seems like a person who is ridiculing his/her Lord. 

Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.504.

28. A True Worship 

The value of worshipping does not depend on the number of prayers or fasts. Instead, true worship is pondering deeply on Allah and everything related to Him. 

Ibn Shu’bah, Tuhaf al-Uqul, p.442.

29. Knowing Allah

The first step in serving Allah is knowing Him.

Al-Shaykh al-Saduq, Al-Tawhid, p.34. 

30. Allah's Reward

Whoever smiles at his/her fellow believer, will win Allah's reward. 

al-Shaykh al-Saduq, Kitāb muṣādaqat al-ikhwān, vol.1, p.157. 

31. Give Thanks

The one who doesn't gratify a kindness received by others has not given thanks to Allah Almighty. 

Al-Shaykh al-Saduq, Uyoun Akhbar Al-Ridha, vol.2, p.24.

32. Committing Sins

Insignificant sins lead into great sins and the one, who doesn't have any fear of Allah while committing the insignificant ones, won't feel any fear in doing the great ones. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.73, p.353.

33. Forbearance

You are not a devout worshipper if you do not seek forbearance. 

Muhammad ibn Ya'qub al-Kulayni, al-Kafi, vol.2, p.11.

34. Neighborhood 

If your neighbor is not safe from your harm, you are not among our followers. 

Al-Shaykh al-Saduq, Uyoun Akhbar Al-Ridha, vol.2, p.24.

35. Promises

The one who breaks promises is prone to unfortunate incidents.

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.67, p.186.

36. Relief and Despair

Verily, relief, and success comes after despair.

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.52, p.110.

37. Faith in Allah

Faith includes knowing by heart, confessing by the tongue, practicing by all parts of your body. 

Ibn Shu’bah, Tuhaf al-Uqul, p.422.

38. The Manner of a Believer

A believer does not leave aside what is right, when in anger, and does not go astray, in happiness, and does not take more than he/she deserves, while in power. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.75, p.355.  

39. The Stingy, The Envious, The Ruler, The Liar

There is no peace for the stingy, no pleasure for the envious, no guarantee for the rulers, and no conscience for the liar. 

Ibn Shu'bah, A Summery of Tuhaf al-Uqul, hadith no. 500249. 

40. A Deceitful Worship

Doubt the faith of the one who shows off with his/her worships to Allah, since Allah Al-mighty abhors bragging about worship and appearance. 

Mohammad-Baqer Majlesi, Bihar al-Anwar, vol.70, p.252.