All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
It is known that being a father requires one to have a wife children and the like. However, Allaah is One, He is The Eternal Refuge, He neither begets nor was He begotten, and He does not have a companion [i.e. wife], nor a son. He informed us about all this in the Quran.
It was not befitting for ‘Eesa (Jesus) to address his Lord with the term ‘father’; he was a Prophet and he was one of the most knowledgeable people about Allaah, and he had the best manners with Allaah. Allaah Says (what means): {And [beware the Day] when Allaah will say, “O Jesus, Son of Mary, did you say to the people, ‘Take me and my mother as deities besides Allaah?’ He will say, “Exalted are You! It was not for me to say that to which I have no right.}[Quran 5:116]; and this is among his good manners with Allaah.
With regard to this word (father) being mentioned in the bible, then if you refer to the Ingeel (i.e. Gospel) which Allaah revealed on ‘Eesa then there is absolutely nothing like this, and it is not permissible to doubt this fact. However, if you refer to the book which the Christians have today (the Bible), then it has been falsified as mentioned in the Quran. The contradictions which exist between the different versions of the bibles of today are clear evidence proving this. For more benefit on the falsification of the bible, please refer to Fataawa 90449 and 83730.
As regards the reason why the Christians believe that ‘Eesa is the son of God, it is because they believe that he was born without a father while there is absolute evidence that his mother, Maryam (Mary), may Allaah exalt her mention, did not fornicate, and that ‘Eesa spoke in the cradle and declared his mother innocent from such a sin. Therefore, since they did not find a father for him, and found texts which state that he is a word from Allaah and a spirit from Him, then they traced him back to Allaah as his father; High Exalted is He from such a claim.
For more benefit proving the false claim of the Christians that ‘Eesa is the son of Allaah, please refer to Fataawa 88187, 90986, 84277 and 82300.
Allaah Knows best.