In my case, as a theist, however, I don't think that I've gotten sick or annoyed of debating in forums yet. It's just that I don't do it as often as I used to before when I first joined almost two years ago. A lot of the things that I want to say have already been said before in some of the older threads. That's the main reason I don't post a lot. Before, I used to jump in and start discussing in almost every thread in the Islamic section. But, now, that has decreased since then as I tend to read them only and then I quietly exit the thread. I do occasionally post something when someone asks a question or when someone wants to know something. But, I try not to repeat the same thing too many times and I try not to reply in a "you're wrong and I'm right" kind of way. I just write out my own opinions and my reasoning, but I can't prove anything.
That said, I do enjoy discussing religion every now and then. I don't think that I'm ever going to get bored of it. Maybe I will, sooner or later, but I don't know. I post in a few Islamic forums as well (one of them which I moderate also). Sometimes I take a break, but then I come back again. And, even while debating in an atheist forum, I did learn many things about Islam which I didn't know before. So, I don't feel that all these discussions are entirely a waste of my time or a pointless endeavor because I find that there is something positive in it for myself, at least.
That said, I do enjoy discussing religion every now and then. I don't think that I'm ever going to get bored of it. Maybe I will, sooner or later, but I don't know. I post in a few Islamic forums as well (one of them which I moderate also). Sometimes I take a break, but then I come back again. And, even while debating in an atheist forum, I did learn many things about Islam which I didn't know before. So, I don't feel that all these discussions are entirely a waste of my time or a pointless endeavor because I find that there is something positive in it for myself, at least.