There are plenty of places where Christians can discuss Christian theology. Churches, friends, church groups, Christian forums, YouTube comments about Christian videos, Facebook Christian pages etc....
If anyone wants to discuss it in a forum, why not send each other private messages?
The only problem here is - I agree above- that the responses people leave on the threads are not always what others want to hear. I am interested in debates but I think debates should be done in forums set up specifically for religion-debates. I may be interested but don't believe in it, and my theories on the matter may offend Christians. So I most likely should not. But discussing theology usually leads into a debate.
People don't want to hear "well my truth is the only truth" which none of us straight out say it but we hint at it through our answers. It hits very close to the borderline. It's something that should be dealt with caution.