"Theistic beliefs are unnatural"

Well,studies show that theistic/religious beliefs are normal,even in atheistic households,and just in the world in general,from what i am aware of,the book ''Born Believers: The Science of Children's Religious Belief'' by Justin L. Barrett shows that,so i mean i do not claim that this proves that religion is not an illusion,but it does prove its not unnatural to have religious/theistic beliefs.