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Please explain “dumb.”
My generic reply is, it has nothing to do with faith. Both those on the extreme end of the faith and those with no faith can be extremely stupid. No debate there.
Dumbness and faith do not have a causal relationship (regardless of how you define dumbness), neither can one predict the other 100% of the time. However, the question can come down to how most people who have a faith act and how those who don’t have any faith act. But what most people would do does not determine what everyone would and does do.