Differences Islam and Christianity disagree over Jesus' identity Although Muslims believe in one God, as do Christians, they reject as heresy that this one God is three persons. For more detail on what Christians believe on this, see the slot we did on this a few weeks ago which is posted on our website. For now, let's suffice to say that Muslims reject the idea of God being three in one. Especially, the Qu'ran (main holy book of Islam) is strong on saying that Jesus isn't God; 'Isa (Jesus) was simply a created human being, and a slave of Allah' An-Nisa' 4:172 Jesus is given great honour in the Qu-ran, his status as a prophet and as a miracle-worker, even as God's Christ is strongly affirmed. But he's not God. In contrast the Bible is adamant that far from being just a created being, that Jesus is God himself become a human being. 'In the beginning was the Word, and the Word was with God and the Word was God...The Word became flesh and dwelt amo...