1/2 with a bad opinion of Islam is too few. Do only 1/2 the people in the US have a bad opinion of the KKK. The islamofascists are worse they are both racists and sexist.
Of the half who claim they don't have a negative opinion, some are simply bowing down to their PC overlords. The rest are leftist fools who, seeing a sword-wielding muslim and a Bible-wielding Christian bearing down on them from opposite directions, will choose to face down the Christian and will do so right up until the moment their heads go flying off their necks.