Christianity, just as much as Islam, teaches children that unquestioned faith is a virtue. You don't have to make the case for what you believe. If somebody announces that it is part of his faith, the rest of society, whether of the same faith, or another, or of none, is obliged, by ingrained custom, to "respect" it without question; respect it until the day it manifests itself in a horrible massacre like the destruction of the World Trade Center, or the London or Madrid bombings.