Well even if this was true, it would be an ad hom fallacy. Here are some reasons it is not true.
Archaeologist Sir William M. Ramsay was a skeptic before he studied biblical lands for 15 years and subsequently stated Gospel writer Luke was a great historian (with regard to non-supernatural events).
One piece of evidence I presented was that of a Jewish Rabbi who stated that "Oral Tradition Evidence" was superior to written evidence at that time. Oral tradition was an important way to relay information in that time of little literacy and no paper or printing presses.
Also probably the greatest evangelist who ever lived, the apostle Paul, at one time approved of the killing and persecutions of Christians.
And even I was a skeptic/atheist at one time.