Welcome here you can discuss with bible smart people and possibly make new friends,hope you like it here!
And Winerose is quite right discussions on the topics you asked about tend to be one sided on the part of a an atheist or homosexual person because many come here seeking acceptance or seeking to change people here by spreading a false doctrine or sometimes just being outright mean,putting down people for reading the bible,now to answer your other question,no person is banned simply for being atheist,homosexual,or otherwise,everyone must abide by the rules of the chat rooms and forums.
As I said many have come here for different reasons and been banned for legitimate rule breaking reasons,such as self or product advertising/soliciting(asking people for money)
Deliberately preaching or teaching doctrine completely opposite of the bible,requesting private messages or dates from members here after just starting out being here.(this isn't a dating site)
Harassing others by insulting with intent to hurt others.
My advice would be to take one step at a time,find which forum is comfortable for you and post a thread asking questions with the intent of "learning" and you should be fine.