As a historian how should one handle one's own beliefs when it comes to God when faced with evidence that may not conform to one's own beliefs?

A historian should always put his professional reputation on top of any personal bias he or she could have towards any event in history. Therefore, the written work that is made or presentations historians make should always be done presenting an impartial and unbiased tone. Otherwise, a historian faces the risk of having groups of people of people who disregard his work due to his opinions over the existence of God.