From personal experience, I have found the fact that the bible only seems to mention symptoms of mental illness in connection with affliction with by demons, which can be scary, difficult to come to terms with and stigmatising as someone who's had mental illness.
Today it is known that many people experience mental illness or breakdowns as a result of trauma or abusive experiences or stress. There are also some physical illnesses that cause mental illness, for example, Lymes Disease can cause psychosis.
Surely, the assumption that is often made that a person needs deliverance and has likely been demonically afflicted because of their sin (ie the fault is with them) is outdated and also potentially harmful.
I can tell you how John Calvin would have dealt with this question, though of course in the 16th Cent he probably shared that view of mental illness. He believed that Scripture often described things in terms that the people would understand. This is the way he dealt with the fact that Genesis included descriptions that didn't match what the science of his day knew was true. It's the way he dealt with a number of other problems of a similar sort. He referred to it as "accommodation." That is, God accommodated himself to the level of understand that people had.
God's purpose was to show his healing power, not to teach medicine.
One can, of course, maintain that demons do exist and affect people, even though most mental illness has physical or psychological causes. Scott Peck is a psychiatrist who has written some interesting books taking that viewpoint. He thinks that a very small fraction of people with mental illnesses are actually affected by Satan and his minions. It's rare, but it happens. You could take that position, and believe that all of the people Jesus healed happened to be ones with demonic disorders. It's possible, but I think it's unlikely. I believe the better explanation is that this was an accommodation to the level of understanding of people in the 1st Cent.
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