Humanity does distinguished mentally-challenged things all the time. And because of that, it HAS to be related to religion? Are you that dense?
Im not saying that it has to be because of religion but if the same shit has happened 100 times in the past because of religion than the first thing that comes to my mind is religion.
You have to prove to me without a shadow of a doubt it had to do with religion. First off, Islam condemns suicide bombings. Just because someone blows themself up and are Muslim doesn't mean they did it in the name of God. Secondly, using anyone to murder people, much less distinguished mentally-challenged folk, in the name of a religion is a complete contradiction.
Learn to accept that people have personalities, goals, and reasons for doing actions outside of their religion. Suddam made huge statues of himself. Islam condemns such things. That does mean that just because the dude was Muslim Islam teaches that. No matter how many times something happens, it would be ignorant and foolish to make such assumptions on something as important as religion.