Perhaps the reason all the various fundamentalist movements in the world's religions are in such a froth is because religion (at least as we've known it for 3000 years) is dying.
I don't really see any compelling reason, apart from legal requirement or intimidation, to be religious anymore.
See ya in church on Sunday!
I don't see any compelling reason to NOT be religious either. Missionary atheism is but the other side of the coin from missionary fundamentalism. Perhaps another question is why we think it necessary to bend and conform others to what we believe. Why should we feel threatened when others don't see the world as we do.