Said differently, amongst many believers that I've encountered, there is such an arrogance about how one understands the tenants of their faith that they are never able to consider that their assumptions drawn from the scriptural texts may be incorrect.
And so their ignorance has a protective shield of "faith" around it when that thing they so viciously hold dear as truth is actually a rabid and gross misunderstanding of the scriptural text they claim to adhere to. And any attempt to correct that misunderstanding is perceived as an attack on their faith.
And so, rather than finding the highest, most edifying traits as found in many a faiths (Compassion, Grace, Love et cetera), these ignoramuses leverage a malformed understanding of spiritual texts to justify the most base and vile of attitudes and beliefs - turning hate, suspicion and intolerance into virtues of their "faith".
*And if there ever was a great evil, a demon, a great Satan so conjured, it's when true believers codify their prejudices, hatreds and fears and project them onto a god they call the only true god, even if their god so conjured stands in evil opposition to the god of their scripture.
I've seen this phenomena first hand amongst the right wing evangelical Christian fundamentalist communities and it seems to me to be very similar to right wing Islamic fundamentalism as well.