Why is there mental illness (according to various theologies)?
According to traditional Christian/Jewish/Islamic belief we are placed on this earth to have a chance to accept/reject God (or to be tested if we will obey/disobey God’s laws). It’s postulated that our testing is the best explanation for our existence, our world, free will, moral laws, suffering, the universe, and every other part of the human condition. It’s all so we could accept/reject God.
Yet, there are millions of people who are born with cognitive impairments and are not at all capable of making these kinds of spiritual/moral choices. They don’t have the same mental capacity that you or I have to make moral choices.
Why would God ordain/allow the birth of so many people with such cognitive deficiencies?