I am an atheist myself, and I feel there is some offensive behavior in the theist/atheists threads. I think most of the posters are well intentioned, but I do think they say things that they wouldn't say if they were face to face with you, and they can be belittling and argumentative. There are some abusive Theists also, but I see it more often with the Atheists
I finally just mostly stopped going to those threads because it was just tiresome. If you want a discussion where your ideas are considered and tactfully discussed, this is not the place. If you want to learn something, I suggest you read older atheist/theist discussions. Probably the point you are trying to make has already been discussed, many, many times (which may indeed be part of the problem ). Maybe if you are just reading, it won't feel so personal and insulting. Who knows, you might learn something.
Don't feel like all posters here are like that. This is just a subject that people feel very strongly about and that does get very heated, it's just not for everybody, especially because we are ex JWs, the open debate and heated discussions can feel very intimidating. Just remember that if you wanted to be with people who all believed the same as you did, you could have stayed in the Borg.