Please go to your preferences page and make sure your "See Mature Topics" setting is set. Setting it to "Yes" means you see the Mature Topics forum (contains political and religious debates). Setting it to "No" means you do not see those threads.
I'm gonna go ahead and say welcome to the forums. Remember to read the rules, and also to post an introduction thread. Everyone here will be very welcoming if you do post a good introduction thread, in the greetings forum, but remember to read the guide on good things to say, otherwise people might be a little hostile.