Islam is a Christian based heresy. There is a lot of evidence that Mo was exposed to Christianity and Gnosticism, the three biggest being his employment as a trader, the stories in the hadith that say so, and the passages in the Quran that are perverted versions of stories in the Hebrew Bible, the New Testament, and the Gnostic works. It is painfully obvious that he borrowed his stories, and the errors in them prove them less than genuine. If you want to make an argument about what is revelation the Quran is the last place you want to look. Especially since it contains such golden nuggets of awesome as telling his followers to test what he said by the Bible. He failed the test.