I don't even bother debating anymore. I just say, "please stop, you're wasting your time," (or something of a similar vein) and that's it. I guess it became boring to me a long time ago.
I'll agree with Adriana on this and say you're probably bored with stuff in general. We're in the final stretch of winter when nature fools us into thinking we're almost done, and then hits us with more snow. It can wear on the nerves. :)
I thought it was do to the fact that I just came out as an atheist last year. I even reasoned it out to being that I never really payed attention before but now I am re thinking that idea. Lately I am running into it around every corner.
I wonder if they are all getting excited because gods coming out in May. Could be that they are worried that they haven't been theist enough to get into Heaven so they are playing catch up.
Yeah, it probably is boredom. But I also think that many of them probably have their doubts and argue with us to try and affirm their belief in some weird way. Kind of like if they can convince an atheist they are right then it must be true that god exists or something equally crazy.