Comparative mythologists do make the same point, but Jung and Campbell (a Jungian) drag a lot of baggage with them. You don't need to believe there's a universal unconscious or that the religious myths are eerily, allegorically true to think there are literary relationships between them.

I do think entheogens provide the eerie basis of religious myths, but there need be nothing supernatural about their effect on the brain.

I'm not claiming the Christ myth theory I'm analyzing here is original. I'm just trying to present it in the most commonsensical terms, without the woo.