Abnormal behavior as a physical disease, .it is not some kinds of demonic possession.

Freud’s structure of the mind

Freudian Theory of the Structure and Function of the Mind
The Structure of the Mind

-Id (pleasure principle; illogical, emotional, irrational)
-Ego (reality principle; logical and rational)
-Superego (moral principles; keeps Id and Ego in balance)

Defense Mechanisms: When the Ego Loses the Battle with the Id and Superego
-Displacement & denial
-Rationalization & reaction formation
-Projection, repression, and sublimation

Psychosexual Stages of Development
-Oral, anal, phallic, latency, and genital stages


Use of religious method for abnormal behavior:
supernatural tradition
Deviant behavior as a Battle of "Good" vs. "Evil"
-Deviant behavior was believed to be caused by demonic possession, witchcarft, sorcery
-Treatment included exorcism, torture, beatings, and crude surgeries like trepanation.
-paracelsus and lunacy (The moon and the starts)

*source:
Abnormal Psychology: An Integrative Approach, 4th Edition, David H.Barlow.