Remember this is not a failure of conclusions (Trump is sent by god), but a failure of proceedings (belief and faith is superior to facts and reality).
They lack the critical thinking skills to even begin to digest and elaborate an argument that relies of evidence and principled thinking. They don’t evaluate reality on principles, they evaluate reality on emotion, identity and authority above all else. Therefore, fact checking is not even a possibility.
You’d often finds that religious extremists prefer to prey on the mentally unwell. They’re more susceptible to abuse and easier to turn into abusers themselves. Then the chain repeats and the abuse self-replicates, propagating the abuse. Very sane and well adjusted individuals can be made to be really cruel and destructive via religious abuse.