I'm puzzled by the fact that you read "little" to mean none, and that taking a position contrary to most biblical scholars makes me "simply not credible."  You don't have to like or agree with Richard Carrier to appreciate the depth of his arguments for the ahistoricity of Jesus. Where is the independent evidence outside the N.T.? Regardless, the historicity of Jesus is not even my primary concern. I'm making an argument about faith, from an a-theist point of view.  Are you saying that only theists can make a credible argument about faith?  Only believers can be believable?

Imagine that climate scientists based all of their claims about our past, present and future climate on a single source?  Imagine that none of their "evidence" could be tested or verified by independent means. How believable would their claims be?  The fact that many of the same people who believe all the claims in the Bible suddenly become skeptics when assessing scientific claims reveals how faith hijacks reason.