My answer to the title is this: in Islam, yes, it is religiously wrong to kill oneself. The norm for who do it is going to Hell, but that's just the norm and it really depends on circumstances. Those with mental problems, for example, are seen as an exception. The reason is because in Islam it is believed that humans were created mainly (not only, mind you) to worship God, humans don't ultimately (but not perfectly, if that makes sense) own their bodies, and because killing oneself (again, within the norm at least) shows the ultimate despair, and that's forbidden in Islam. The Quran does say it in a direct order tone in two places; do not kill your selves & do not send yourselves to your demise with your own hands. If we think of it logically, tons of cases in this life have those who either depend on them, care for them, love them, want to be with them, lent them stuff... and in so many cases there are who could receive serious damage losing who kill themselves. The other day I read about a suicide case that left behind two wives and 6 children (or was it 10?) here in Saudi Arabia. Imagine the possible hardship because of their loss in a male dominant country (the world is male dominant already, but that's a different subject).