Religious fundamentalism and the attendant legalism and moralism have defined outcomes.
Polarisation.
Isolation.
Extremism.
Hypocrisy.
Self-righteousness (potentially malignant).
Ignorance (potentially militant).
Addiction.
Irrationality.
Blindness.
In these fertile circumstances extant bad and the capacity for bad are amplified dramatically.
Scientific studies would be great.
In the meantime a guru from Nazareth once said:
"Do you have any idea how silly you look, writing a life story that's wrong from start to finish, nitpicking over commas and semicolons? You're hopeless, you religion scholars and Pharisees! Frauds! You burnish the surface of your cups and bowls so they sparkle in the sun, while the insides are maggoty with your greed and gluttony. Stupid Pharisee! Scour the insides, and then the gleaming surface will mean something. You're hopeless, you religion scholars and Pharisees! Frauds! You're like manicured grave plots, grass clipped and the flowers bright, but six feet down it's all rotting bones and worm-eaten flesh. People look at you and think you're saints, but beneath the skin you're total frauds." (Matt 23, Message Bible).