When is a Religious Belief Delusional?

[Anomalocaris]

Yes, because some of the people Plutarch speaks of are real.  And a few are mythic heroes.

Plutarch isn’t believe for the exceptional claim he made, requiring exceptional evidence he did not provide. The most worthless and unconvincing sources are those that makes extraordinary claim without showing significant sign of cognizance of their needing to provide extraordinary evidence and submiting to even more extraordinarily rigorous examination.

Christian sources are in the latter category. They are uniformly either fools or liars. Fools and liars can also get the color of sky right. But that is no evidence for their more extraordinary claims being of any merit.