Early Muslims

    Prophet Jesus (pbuh) and all the other prophets from Adam to Muhammad (peace be upon them) were sent with the same Message, to command human beings to worship Allah alone, and not to join in worship partners with him. Prophet Jesus (pbuh) never claimed divinity. He taught the Oneness of Allah and confirmed that he was a just a Messenger. 
    Jesus said:"… I am returning to my father and your father, to my God and your God." (John 20:17). 
"By myself I can do nothing; I judge only as I hear, and my judgment is just, for I seek not to please myself but him who sent me. "(John 5:30).
The disciples followed the teachings of Prophet Jesus (pbuh). They worshiped Allah alone and kept religion pure for him. They believed and supported Prophet Jesus (pbuh) to such an extent that Allah that Allah held them up as an excellent example to Muslims in the Qur'an:
    "O you who believe! Be you helpers (in the cause) of Allah as said Jesus - son of Mary-, to the disciples:"Who will be helpers in allah's cause?" The disciples said:" We are the helpers of Allah (i.e. we will strive in His cause)! Then a group of the Children of Israel believed and a group disbelieved. So, We gave power to those who believed against their enemies, and they became the victorious." (Qur'an, 61:14). 
    Jesus the merciful Prophet (pbuh) commanded his disciples to be kind and merciful and to forgive others. Let the Qur'an now describe the followers of Prophet Jesus (pbuh):
    "Then, we sent after them Our Messengers, and We sent Jesus -son of Mary-, and gave him the Injeel (Gospel), and placed compassion and mercy in the hearts of those who followed him." (Qur'an, 57:27). 
    "Verily, you will find the strongest among mankind in enmity to the believers (Muslims) the Jews and those who are idolaters, and you will find the nearest in love to the believers those who say:" We are Christians." That is because amongst them are priests and monks, and they are not arrogant." (Qur'an, 5:82).
    After the Ascension of Prophet Jesus (pbuh) to heaven, most of the Christians remained Unitarian. They used to believe in the Oneness of Allah following the teachings of Prophet Jesus (pbuh) and all the other Prophets. They did not believe in the doctrines of Trinity, Original Sin, Blood Atonement or Divine Sonship of Prophet Jesus (pbuh). After centuries of persecution against the Unitarian Christians, the Pauline Church prevailed and the teachings of Paul replaced the teachings of Prophet Jesus (pnuh) and Paul became the real founder of today's Christianity. 
    Paul, the self-appointed thirteen apostle who never saw Jesus (pbuh), wrote more Books of the Bible than any other author, while Prophet Jesus (pbuh) did not write a single word, as the original Gospel revealed by Allah to Jesus (pbuh) was lost. However, Paul replaced the Gospel of Jesus (pbuh) with a gospel written by him and invented the doctrines of Original Sin, Blood Atonement and Divine Sonship of Prophet Jesus (pbuh). With the exception of few verses, all the verses in Paul's letters are his own words and not the words of Prophet Jesus (pbuh):
Remember that Jesus Christ of the seed of David was raised from the dead, according to my (Paul) gospel. (2Timothy 2:8) (KJV).
    After the loss of the original Gospel of Prophet Jesus (pbuh), many gospels were written. These gospels include some of the genuine teachings of Prophet Jesus (pbuh) mixed with people's own texts and interpretations which were influenced by the beliefs of that period. Therefore, it became difficult and sometimes impossible to know which parts came from Allah and which from people. As a result, Christians deviated from the teachings of Prophet Jesus (pbuh) and followed the teachings of hundreds of monks and priests which resulted in hundreds of religious groups having different beliefs.