Visiting the States always provides an interesting opportunity to think about the many ways that living in Qatar has changed me. For example, I'm a lot more gregarious than I was when I lived in Pittsburgh, and generally a lot less fearful -- or at least a lot better at ignoring my fear.
A more obvious example is that I didn't drink before I moved to Doha, and indeed viewed drinking as immoral, whereas now I don't mind drinking. This is actually indicative of a larger shift in my thinking about ethics. Islam is willing to condemn a lot of behaviors which may or may not be inherently harmful, simply because it is believed that God disapproves of them. Of course, plenty of Christians do the same, but my increased familiarity with another religion's list of disapproved behaviors has thrown into sharp relief the problems with divine command theory. It no longer seems reasonable to argue that an action may be unethical simply because one culture's version of God has taken a disliking to it. If an action is unethical, it seems to me, it must be so because it causes harm (is likely to cause harm, has a tendency to cause harm; let's not get too utilitarian here). On a more personal level, seeing Muslims avoiding actions that seem morally neutral to me (like falling asleep on one's stomach) for fear of offending God has made me realize the extent to which my own "moral" stances were motivated by the same desire to be "good enough." I wasn't avoiding alcohol because it has deleterious effects on society; I was avoiding it because doing so allowed me to think of myself as A Good Person. That no longer seems like a good motivation, and thus, I no longer avoid alcohol.
Rethinking the role of religion in ethics made me rethink religion generally, and about six months ago I came to the conclusion that I am no longer Christian. My allegiance is fundamentally not to a Christian worldview but to a secular one. (Thought experiment: if I could choose between a universe in which the Muslim world universally accepted Jesus' messiahship, or one in which it universally accepted the principles of tolerance, free inquiry and rationalism, which would I pick?)
I'm not sure what else to say on this subject, so I'll end here.
I will, however, note that I wrote a long post on secularism a year ago, but never polished it enough to post it publicly. Since I'm unlikely to make any further changes to it now, it is now publicly viewable
here.