If you have not yet done so, I suggest that you invest a few moments in reading the Posts of the Month forum. In there you will find examples of posts that were considered outstanding, things to be emulated.
Almost all closings are related to one of two reasons. The first is a length limitation. We have found that after about 300 posts, most threads have run their course. Therefore, at around that witching hour, threads are closed. If there is (as is often the case) still something to be discussed, we encourage a continuation thread be proposed. That works well as a way of refining the direction of the discussion.
The second most common reason for closings is a temporary close. This is simply a pause to allow everyone to rethink their message before posting and will usually happen when a thread really takes off with many posts in a short period of time. It's but the internet equivalent of three deep breaths.
Bannings too need to be understood. No one so far has been banned for their point of view. Creationist, Evolutionist, Theist, Atheist, all are welcome. Bannings happen based on behavior. If you follow the rules, all will be fine.
At the end of this post you'll find some links to topics that may help you enjoy your stay here. Don't fear the Admins (except for the Queen), they, like the Government, are here to help you.