I just think of major world religion.
I’ve studied Islam in school and learned a lot of interesting things about the faith. One thing that many people may not know for example is that during the dark ages when Christian Europe was bleaching Roman and Greek manuscripts to reuse for religious purposes, the Islamic world was preserving, learning and expanding on that classical literature. Essentially, they had a renaissance much earlier than Europe did. The only reason we are able to read some of these great works of classic Greek and Roman literature today is because we have the records from the Arabic translations.
@Lunafemme, I had a roommate in college who was muslim. He wasn’t really a “sunday muslim” as you put it, because he rarely went to mosque, he drank and didn’t pray like he should. He did observe the month of Ramadan though. I think it’s actually fairly common for muslims to drink and not be very serious about their religion, it’s just that we tend to hear about the extremists and not so much about the regular guy who isn’t particularly serious about his faith. Think about how many Christians in America are like that, I think in many Middle eastern countries it is similar.