TBF, if not for Iraq, it's quite possible GWB would be remembered for his faith.
It's difficult to know exactly what GWB saw in Iraq. He may or may not have known that the WMD claims were mostly a result of bureaucratic muscling propping up some very shaky intelligence. I sorta imagine he didn't, odd as that may sound.
Seems to me like he really was naive enough to both buy Cheney's puppets Intel, and that the American conception of freedom was universal, and simply denied to the people of Iraq by political obstacles.
His presidency is defined by that combo of unique American naivete and idk... chauvinism?