"We wrestle not against flesh and blood," wrote Paul in Ephesians 6:2, "but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places."
This exposes the paradox of those that style themselves Christian fundamentalists that choose to ignore and defy the injunction of Jesus Christ to love their neighbours as they love themselves, but rather rage at those that dare to not believe strictly as they believe.
Because, for fundamentalists there is no love, no pity, no mercy in their ceaseless war against other faiths and what they, fundamentalists, have determined are false teachings, because they can not recognise their onslaughts as simply hatred for those against whom they rage and wage war, for they suffer from the intractable delusion that they are in a struggle against their beliefs and Satan himself.
That the fundamentalist is blind to the commandment of Jesus to love their neighbours, even when they are of another faith, and this is their fundamental flaw from which they have left themselves no avenue of escape except to wholeheartedly embrace the teachings of Jesus. Failure to do this dooms them to remain in their delusional state and ignore Jesus Christ until it is possibly too late for them to turn aside from their vengeful quest and accept Jesus' invitation to follow Him.