Who else sometimes has less faith in history than in theology? Alternate history is possible. Yet rigorously enough deduced theology can be more certain.
Example/Stimulus: Book Highly Theoretical Differential Equations of the Afterlife
Theology is the study of God. Therefore there are commonly held reference resources/source material that everyone bases their studies, theories, hypotheses, which included but not limited to the Holy Bible, Torah, Quran, Book of the Dead, Vedas, Coptic Gospel, etc.
However, history is His Story. It can be propaganda written by the winner. It can be racially, culturally, and nationally bias. It can be altered by commission or omission. Therefore historical records can be written as a complete lie or variations of the truth.
Theology relies on faith in God/gods. The source material for study is inspired by God to man. History relies on faith in man. The source material for study is dictated by man to man. Who do you trust?
Psa_118:8 It is better to trust in the LORD than to put confidence in man.