[mr_overalls]

Psychology and sociology can be made as rigorous as individuals & institutions care to.

Theology, not so much.

[high_5]

Actually most of the (christian) theology (when discussed by theologists) within its confines is very rigorous.

[mr_overalls]

Theology can be rigorous in the sense of its models possessing internal validity (logical consistency, parsimony).

However, because it's basically speculation about unobservable entities, theology completely lacks external validity.

Social sciences can have both.