What are the main differences between Islam and today’s Christianity?

1. In Christianity, there exists the creed of trinity but in Islam, the creed of oneness. 

2. Islam includes all heavenly religions and prophets; Christianity accepts only the Bible as the true book; it does not accept the Quran as a book based on revelation.   

3. Christianity claims that man is a sinner by birth and therefore, he needs to be baptized to be cleaned; Islam states that all people are born sinless and that nobody bears the sin of another person. 

4. In Christianity, priests and clergymen have the authority to forgive people’s sins when they confess; in Islam, sins are forgiven only by Allah.

5. In Christianity, the words of Jesus are regarded as the words of God; in Islam, divine orders are conveyed through revelation by Gabriel (Jibril). 

6. According to Christians, Jesus was crucified. According to Islam, he was ascended to the sky, to the presence of Allah. 

7. Although today’s Christians claim that their religion is the last religion, that claim is not valid according to Islam because the following is stated in the Quran: "The Religion before Allah is Islam (submission to His will)..." (Aal-i Imran, 3/19); "If anyone desires a religion other than Islam (submission to Allah) never will it be accepted of him; and in the Hereafter he will be in the ranks of those who have lost (all spiritual good)." (Aal-i Imran, 3/85).

(see. Şamil Islam Encyclopedia, Christianity)