Seemed to have a relatively intimate knowledge of Judaism/Christianity to have written the Qu'ran.
I wouldn't be able to do the same for Islam.
It wasn't that intimate. I think I mentioned in one of the other posts, but there is a passage in the Quran (Surah 9:61) which talks about Muhammad being 'an ear/all ear' (ie. he believes everything he is told). In Arabia the time there were stories from Jewish tribes which can be found in the Talmud and other extra-Biblical sources, which can now be found in the Quran. There were also Christian heretical cults in 7th century Arabia that told similarly non-Biblical stories about Jesus and Mary, which are now in the Quran. The Sabians, the Persians, and other pagan tribal groups in the area had practices like circling the black stone and praying five times a day, and believing in a paradise with perpetual virgins. Those are now in the Quran (and the hadith) too.
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