So what - It takes decades or centuries to establish doctrines, that means nothing. Scripture demands a Trinitarian explanation for God, I could give you verses, but I really don't see why this is so important to you. Christians and Muslims do not worship the same God, period. The Quran even contradicts itself on the nature of God and other items and should be tossed based on that issue alone. Jesus said plainly I and my Father are one, the Arians (later to be JW's and Mormons) were rebuked and labelled heretics at the earliest church Councils (Nicea), and with very few NT Manuscripts to analyze at the time, that should not alarm anybody, who was not predisposed in some fashion.