I am only refering to well established religions such as Judaism, Christianity, Islam, Buddhism, Hinduism, and Shintoism. The people who follow thoes religions are both religious as well as function normaly in society. Even in Christianity that suicide is a mortal sin. Judaism has great emphasis on the sanctity of life and view suicide as a sin. In Islam, its also a sin to comit suicide. Suicide is forbiden in all circumstances even in war. Many of you are going to say, "but we have Islamic Fundies blowing themselves up", thats only a small minority of Muslims. Hindus believe that murdering one's own body is equaly sinful as murdering another. Why even Buddhism sees sucide as a wrong thing to do.
The only extrime religiousness stems into the psychology of cults, especialy dangerous cults such as Scientology and Heaven's Gate.