I completely agree with GIASI as well. Although I don't know anyone in a Muslim/non-Muslim relationship in Qatar (I do in Canada but its a different can of worms there) I do know many people in Korean/Western relationships and many of those have failed due to cultural differences. And those relationships don't even have the problem of coming from two different religions.

Lasting relationships are based on compatibility and understanding, and while I know there are people who have made their cross-cultural relationships work, they are the exception rather than the rule. (Unfortunately).