Why was he banned. All he did was post a topic about a non-Muslim converting to Islam. How doe sthat offend other and how is it against the rules???
Unless you are Perplexing, I am not sure why would YOU be asking this question, and not him. In any case, he can contact the Admin if he wants to know the reason why he is restricted from posting.
Matters relating to banning are no longer open for public debate.