[pgkdan]

his son isn't circumcised, and his wife doesn't wear a head scarf. When I've asked him about it, his answer is, "That's not really in the Koran."

Then your friend is NOT a good muslim because instructions to both points are in the koran. Islam means submission, specifically submission to the will of allah and the 'will' of allah is spelled out in excruciating detail in the koran. Everything...from what to eat and how to take a crap. And that's the point...to be a good muslim one must live in strict accordance with the koran and doing taht would rule out the possiblity of being a 'good' anything else.

[Question_Assumptions]

Circumcision is not mentioned in the Koran. Neither are headscarves. Both are elements of Arab culture, not Islam, and many Arabs confuse the one for the other. If you think these practices are specified in the Koran, please cite the passages.

[Question_Assumptions]

Bear in mind that what's in the Quran isn't necessarily what the Wahabbists, militant Iranians, and Taliban claim is in the Koran. For example, there were articles on Free Republic pointing out that the English translations of the Koran provided by these groups use wording not necessarily supported or implied by the original Arabic. It's like certain Christian sects (which shall remain nameless) that require specific English translations of the Bible to support their theological stances, despite the fact that the original language of the Bible is not nearly so clear as the English in that translation implies.