The circular logic is believing a text because the text says it comes from an unquestionable source. Discounting claims that have zero credible evidence is completely reasonable, both of us do it daily. Claims require evidence, supernatural claims require more evidence. Again, I'm sure we both dismiss ridiculous claims that are without evidence all the time. There's nothing circular about that logic.
Most historical sources don't include talking snakes and other fantasy elements, we also still account for the bias involved in the sources except when it comes to religion's sources. Weird huh?