Its a myth, all of it.
Actually, people don't kill themselves in war over myths.
There seems to be a built in or hardwired need for God/gods in humans since the beginning of recorded history. Hence the relative ease with which some huckster can convince them that he has the way.
Islam's staying power has much to do with the fact that it is probably designed by Satan (yep, evil actually does exist too).
That said, someone spreading the Truth is going to encourage his followers to examine it--test it--to make sure it is True.
Islam actually forbids its followers from examining it.