If you read history, you'll find that God is one of the leading causes of death. Has been for thousands of years. Hindus, Muslims, Jews, Christians, all taking turns killing each other cause God told them it was a good idea. "The Sword of God", "The Blood Of The Lamb", "Vengeance is mine". Millions of dead motherfuckers. Millions of dead motherfuckers; all because they gave the wrong answer to the God question. "Do you believe in God?"
"You believe in God?"
"Yes.""You believe in my God?"
"My God has a bigger dick than your God!"
But just think; maybe in a thousand years time, long after we're dead, our descendants will live in a world free from religious extremism. Like the 4000 year reign of the Egyptian faith, or the 2000 year reign of the Greek/Roman faith, all religions eventually die. The Egyptians never thought it'd happen to them, the Sumer never thought it'd happen to them, the Vikings never thought it'd happen to them. 2000 years of Christianity, 1600 years of Islam, 5000-6000 years of Hinduism (which seems to just keep on going), all religions die off eventually.
No matter how many people have been absolutely convinced of the truth of a faith, no matter how many thousands or millions or billions have been condemned to a hell they never knew existed, simply because they didn't know the right words, they all die in the end. Priests, holy men, believers, extremists, fundamentalists, they all end up having their attention diverted elsewhere, all end up shaking their heads at the old mystic superstitions, and all end up believing in something else.
Maybe one day in the far off future, it won't be Christ or Muhammad or Krishna that their believing in. Maybe, just maybe, it'll be ourselves.