If you had said that Osama bin Laden wears ladies underwear, and has poor dental hygiene, you are free to do so, unless you are actually a follower of Islam and are subject to whatever rules and regulations that encompasses.
I didn't see your post as attacking, merely questioning, but even if you were attacking OBL, so what, no-one should be censored on these forums. If it was a personal attack, against another poster, that would breach the TOS, but discussing a public figure, nah.