When Prophet Muhammad (PBUH&HP) was writing letters to the Heads of neighboring states, he referred to Jesus Christ (PBUH) as the messenger of Allah and then invited them to Islam. In his letter to Nagaci, the king of Ethiopia, he wrote: 

“… He, the King, the Holy peace insured dominant, and I bear witness that Jesus son of Mary, the Spirit of Allah and his speech was delivered to the Virgin Mary the good bunker. Allah created Jesus from his soul, just as he created Adam with his hand, and I invite you and your soldiers to Allah Almighty, has reached and advised receive my advice, and peace be upon those who follow guidance”.

Insisting on the fact that he knew Jesus (PBUH) and that he was the son of Mary, he wanted them to know that Islam is no different from true Christianity. The Quran, on the other hand, insists on this and reveals the fact that his name was stated before in the holy books:

 "Those who follow the Messenger, the unlettered prophet, whom they find written in what they have of the Torah and the Gospel, who enjoins upon them what is right and forbids them what is wrong and makes lawful for them the good things and prohibits for them the evil and relieves them of their burden and the shackles which were upon them. So they who have believed in him, honored him, supported him and followed the light which was sent down with him - it is those who will be the successful." (7:157)

But is that true? 

Here we are going to discuss some of those verses and words.

 1. Prophet Muhammad (PBUH&HP) in Deuteronomy 

“I will raise up a prophet from among their countrymen like you, and I will put My words in his mouth, and he shall speak to them all that I command him. It shall come about that whoever will not listen to My words which he shall speak in My name, I Myself will require it of him. But the prophet who speaks a word presumptuously in My name which I have not commanded him to speak, or which he speaks in the name of other gods, that prophet shall die.”(18:18)

Al-Samawal Al-Maghribi was a Jewish mathematician who converted to Islam and had interpretations of the verses of the Old and New Testament. He interprets this verse as referring to Prophet Muhammad (PBUH&HP). The description given in this verse about the future prophet is referring to Prophet Muhammad (PBUH&HP) since it’s similar to the description given before about the children of Esau (Jesus). There is another verse that is referring to Prophet Muhammad (PBUH&HP) in his point of view: 

"The Lord came from Sinai, and dawned on them from Seir; He shone forth from Mount Paran, And He came from the midst of ten thousand holy ones; At His right hand there was flashing lightning for them.” (33:2)

Al-Maghribi states that in this verse, Mount Sinai refers to Moses, Mount Seir refers to Jesus, and Mount Paren refers to Prophet Muhammad (PBUH&HP). [1] 

2. Prophet Muhammad (PBUH&HP) in Isaiah

This chapter is shared between the Hebrew Bible and the Old Testament of the Christian Bible. In verses 1 to 4 of this chapter, we read: 

“Behold, My Servant, whom I uphold; My chosen one in whom My soul delights. I have put My Spirit upon Him; He will bring forth justice to the nations. "He will not cry out or raise His voice, Nor make His voice heard in the street. "A bruised reed He will not break and a dimly burning wick He will not extinguish; He will faithfully bring forth justice. "He will not be disheartened or crushed Until He has established justice in the earth; And the coastlands will wait expectantly for His law.” (42:1-5)

According to the verses above, a prophet was coming from the children of Qedar, the second son of Ishmael [2], and also the nomadic Arab tribe, which was known as the most significant organized Arab tribe [3]. He is also sent to the same tribe to guide them on the right path. The other point about the prophethood of Muhammad (PBUH&HP) mentioned in this verse is that his religion was universal, willing to stand against gods and goddesses. Everyone waited for his coming, and different tribes would follow him. 

3. Prophet Muhammad (PBUH&HP) in John 

“I will ask the Father, and He will give you another Helper, that He may be with you forever; that is the Spirit of truth, whom the world cannot receive, because it does not see Him or know Him, but you know Him because He abides with you and will be in you. “ (14:16-17)

Muslims’ interpretation of this verse states that the two words meaning comforter and famous, were used interchangeably and Jesus in prophesying the coming of Prophet Muhammad (PBUH&HP). [4] They also relate these verses to a verse of the Quran about Jesus Christ, telling his people about the coming of the next prophet:  

“And [mention] when Jesus, the son of Mary, said, "O children of Israel, indeed I am the messenger of Allah to you confirming what came before me of the Torah and bringing good tidings of a messenger to come after me, whose name is Ahmad." But when he came to them with clear evidence, they said, "This is obvious magic.” (61:6)

According to this verse, the name Ahmad is given for Prophet Muhammad (PBUH&HP), and it means the praised one. According to the translations of the holy bible, the word periklutos means the celebrated or praised one means Ahmad. The word is repeated in John 14, John 15 and 16.

According to the verses above, the coming of Muhammad (PBUH&HP) was prophesied by the former prophets. And many Jews and Christians were aware of the coming of a new prophet. However, many of them rejected his invitation. Why? 
You will find out in the next article. 

References

1. al-Maghribi, Al-Samawal; Confutation of the Jews (in Arabic). Syria: Dar Al Qalam, 1989, 75-77
2.  Besharat Ahdein
3.  Stearns and Langer, 2001, p. 41.
4.  Zepp, Ira G. A Muslim Primer: Beginner's Guide to Islam. Vol. 1. University of Arkansas Press, 2000, 50-51
    

Some people ask why Muslims do not celebrate Christmas? Is that because they do not agree on the 25th of December as Jesus birthday? Or is that because they say Christians believe in Jesus as the son of God, while Muslims do not believe in Trinity, as well as they believe that Islam is the religion that is more complete than Christianity and all other religions that came in the past; the same way that Christians believe that Christianity is a more complete religion than Judaism.

But let’s put aside the issue of Islamic view on the date of birth of Prophet Jesus (PBUH). The most important fact that causes Muslims not to wish to celebrate Christmas is the matter of identity. Do Muslims expect Christians or Jews to celebrate Islamic occasions? Does it not sound logical that each culture celebrates its own occasions and rituals? Of course, people who were born Muslims in Muslim countries or communities would like to celebrate their own occasions.

But here we are discussing the issue of those who have converted to Islam. Or those who are Muslim and live in societies with a majority of Christians.

Is it forbidden (Haram) for Muslims to celebrate Christmas?

Jesus in Islam

Prophet Jesus (PBUH) is among the Prophets whose names and stories have been mentioned in many chapters of the Holy Quran. This shows the high status of Prophet Jesus (PBUH) and his respected mother – Mary- for Muslims. Prophet Jesus (PBUH) and his mother are so beloved for Muslims that many Muslims name their children after them, and the Islamic society takes every possible chance to admire their position.

It is for this very high level of respect for the Prophet Jesus (PBUH) that Muslims will be offended when he is called the son of God. Since Allah says in the Holy Quran “ That they attribute to the Most Merciful a son. And it is not appropriate for the Most Merciful that He should take a son. There is no one in the heavens and earth but that he comes to the Most Merciful as a servant.” (19: 91-3)

In the same chapter, Allah says “The Messiah, son of Mary, was not but a messenger; [other] messengers have passed on before him. And his mother was a supporter of truth. They both used to eat food. Look how We make clear to them the signs; then look how they are deluded.” (5:75)

Taking part in Christmas parties for Muslims

The ruling on taking part in Christmas parties is the same as taking part in any other party. It is allowed to participate in Christmas parties if there is no forbidden (Haram) act taking place; such as drinking, backbiting or forbidden (Haram) music, singing, or dancing [i], etc.

In Islamic jurisprudence, there is no harm in celebrating the birthday of Prophet Jesus (PBUH).  Also if Muslims do not wish to celebrate Christmas among their cultural occasion, it is forbidden (Haram) to disrespect Christian rituals.

Do Converts Have any Duty Regarding Their Christian Family?

“And We have enjoined upon man [care] for his parents. His mother carried him, [increasing her] in weakness upon weakness, and his weaning is in two years. Be grateful to Me and to your parents; to Me is the [final] destination. But if they endeavor to make you associate with Me that of which you have no knowledge, do not obey them but accompany them in [this] world with appropriate kindness …” (31:14-15)

The above verses clearly define that respecting and caring for parents in the eyes of God is not because of their religion. But He says that you have to respect them, only because your mother carried you for nine months and fed you when you were a weak baby. Therefore non-Muslim parents have all the rights that Muslim parents have. And there is no difference between Muslim or non-Muslim parents if they ask you to do something which is not accepted by God. In those cases, you have to disobey them BUT keep respecting them and behave kindly towards them.

Congratulating Christmas to Christians

Congratulating Christmas to Christians is not forbidden (Haram), as long as it is not considered to be a confirmation of their belief in Trinity while keeping in mind that you believe that Islam is the last religion sent by God to complete the past religions, but it is rather recommended to respect our relatives, friends or neighbors who are Christians with congratulating them on their happy occasions.

The Duty of Muslims in Celebrating Christmas

Although we discussed that Muslims who live in Islamic countries or Western countries would rather celebrate their own cultural occasions among their Islamic communities, there is a duty upon those Muslims who live in the West and may live with non-Muslim friends and families.

It is a duty upon every individual Muslim to spread the words of God as much as possible. And if a Muslim has the position of clarifying the status of prophet Jesus (PBUH) as a prophet and not the son of God or as a god, then he/ she should not take this opportunity for granted and mention the fact that Jesus (PBUH) was not but a respected Prophet of God.

However, it is not obligatory for Muslims to speak out about this issue when they participate in Christmas parties (in which no forbidden (Haram) act will take place), but if there is a chance of talking about the issue, it would be good to mention the Islamic opinion about the Prophet Jesus (PBUH).

Notes:

[i] Read about forbidden (Haram) music in the related article.

[ii] “This day [all] good foods have been made lawful, and the food of those who were given the Scripture is lawful for you, and your food is lawful for them. And [lawful in marriage are] chaste women from among the believers and chaste women from among those who were given the Scripture before you, when you have given them their due compensation, desiring chastity, not unlawful sexual intercourse or taking [secret] lovers. And whoever denies the faith - his work has become worthless, and he, in the Hereafter, will be among the losers.” (5: 5)

References:

1. celebrating christmas