"The determinist approach proposes that all behavior has a cause and is thus predictable. Free will is an illusion, and our behavior is governed by internal or external forces over which we have no control.
External Determinism
External (environmental) determinism sees the cause of behavior as being outside the individual, such as parental influence, the media, or school Approaches that adopt this position include behaviorism and social learning theory
Internal Determinism
The biological perspective assumes behavior is largely controlled by internal biological factors – genes, brain neurochemistry, hormones, etc.
A new UNSW study suggests we have less control over our personal choices than we think, and that unconscious brain activity determines our choices well before we are aware of them.
In other words, your choice always depends upon what happed before. That is why Muslims reject Christianity and vice versa.