No need for religious beliefs
However, suicide-bombing Muslims truly seem to believe they are going to Heaven. Says a lot about their faith.
I'm sure not.
To be willing to commit suicide they need only two things:
the constant feeling of humiliation and no way out of it;
the recognition of their crime by their own communities (they'll call it bravery).
No need to believe in 72 virgins (that's a western propagated myth); the 19 911 terrorists were not uneducated.