The Bible talks about the faith that Abraham allegedly held in some detail. It says Abraham rejected all the gods of his native country (Sumer) to follow a one god who he believed was calling him. In the Bible we are told he had faith in God and only saw himself as his humble devotee. We're never told he believed he was God's son, semi-divine, or anything found especially in Christianity.
Couldn't an argument be made from what the Bible says that Islam is actually closest to the faith of Abraham- that is pure monotheism? No ideas like God being a father figure, etc.
1. Islam is not even close to the history of the Abrahamic faith. When it can't even get the historical events correct how can it be claimed to get the theological events right?
2. The Quran plagiarized virtually word for word pagan and heretic sources like the Gospel of Mary, the Gospel of Thomas, the Protovelum of James, the apocalypse of Peter, Hellenic medical texts that are medically wrong, Heretical Talmudic texts, etc.... Some of these are entire stories virtually lifted from other texts (which are well known to be wrong to begin with) and inserted into the Quran.
3. Christ, the father, and the Holy Spirit all being God is not a core NT doctrine but even if it was and even if the NT spelled it out emphatically that is no less monotheistic that one entity called God. We believe in one being called God that is composed of three persons. It is a little more sophisticated that one being called God but it is no less monotheistic.
I can go on all day like this but let me stop here for time's sake.
