You seem to have a penchant for name-calling of late. And your response does indicate that you do regard scientists and doctors as if they were of a quasi-priestly kind. All of said quasi-priestly order insist that the cause(s) of mental illness remain “unknown” and that there “may be” a “genetic predisposition”.
I cannot tell what manner of disorder you have, but no chemical imbalance is inborn; I have an aunt that was drugged into near-oblivion who was diagnosed with the syndrome with the ever-changing name (back then it was “manic depression”).
Nobody mentioned “original sin” save yourself. Perhaps you should have asked the person who said “evil will” what that person meant by that instead of presuming?