Are you saying that a person who has absolute, unshakable faiththat he will go directly to heaven if he kills a bunch of people in a fatwah is not more likely to do it than someone who isn't totally sure?
Of course. Absolutely.
Let's assume that as you suggested, tomorrow morning, every Muslim in Palestine and every Jew in Israel wakes up to find that they are Atheists. Would anything change?
IMHO, no. The Atheist Palistinians will still be living in the camps and the Atheist Israelis will still be living in the cities. The Athiest Araffat will still want to be the leader of the Athiest State of Palistine and want the Athiest Israelis driven into the sea.
While religion is often used and misused as a way to motivate horrible acts, it is not the only thing that would lead people to sacrifice themselves for a cause. It could be Booth shooting Lincoln, the assasin(s) that blew up Alexander II, the Athiestic pogrom of Stalin, Mao or Pot.
And under it all, the most common REAL cause is that some group wants to change facts on the ground, to gain power or wealth.
Al Queda misuses religion. No one will argue that. But the underlying cause is not ISLAM, it is that they want to change the power structure in the Middle East.
Acts of violence, whether those of 9-11, shooting Lincoln, Kennedy, Roosvelt, Reagan often require belief in something, but it could be a philosophy, political cause, power, freedom or wealth.
Aslan is not a Tame Lion