I've read the Bhagvad Gita and the Ramayana, The Book of J, miscellaneous parts of the Bible, especially the Old Testament, and attempted the Koran (got maybe 1/8 through the translation I have.) I took a class on Islam that provided lots of other texts, and the parts of the Koran I read were assigned -- had a hard time getting into the rest. The class was good, though, taught by an exceedingly gentle, humble, softspoken man who was appalled at the bad name his religion was getting. (This was 1993 or so.) It was one of those situations where I actually had the advantage, deaf-wise -- the whole class would be sitting on the edge of their seats, brows beetled in concentration, and I'd just let the poor terp, leaning like the tower of Pisa, do all the work.