It is not a blanket statement. He said if it is MORE PRONE. A blanket statement would be: dudes and dudettes of abrahamic religions are more bigot than the other religious dudes and dudettes.
What he said is a different kind of approach.
Is like if I said: all poor people are thiefs (<-blanket statement) or poverty and lack of job oportunity makes people more prone to stealing (<-not so)
That is not what he said. He said that faiths of Abraham are bigoted by structure. I totally disagreed with that.