E. Michael Jones talks about this one. I think it took more than that though. It started with all sorts of bad cough theology.

The term "gullible christians" is redundant.

It's implied by the simple fact that they fell for adult Santa.

They ALWAYS are since the Church fell Nero.

Christianity is the ultimate social experiment. Communism and Covid is only second place when people fall for THAT firmly, hook line and sinker.