I don't hold it against somebody to believe in God
Fair comment, but when they make assertions about reality they should have the intellectual honesty to hold an honest conversation about it.
I am sure that fear is at the root of all religious faith. Fear of the future, fear of the vicissitudes of life, fear of moral ambiguity, fear of death, fear that nobody is actually in control of the big picture.
Sadly that insecurity plays out as a need to threaten others who don't share the same false certainties.