Except the texts are different from each other, it's pretty clear that the reason all three was included was because the Biblical text was collected by committee, and in fact the Churches have never hidden this fact, and they kept all of them to show that fact. In fact the reason I he Muslims decided to destroy all heterodox Qurans, was likely because they saw the disagreement these different texts brought to Christians.
They are different, but that's not the point. That was never the point of what I've been saying. My point is the difference between the individual texts that make up the Biblical canon, and the difference between the source and role of the Bible in Christianity and the Quran in Islam, are not relevant to this discussion. The differences are not so great that Deism can arise in Christendom but the Ummah is somehow immune.