Step 1: Create LLM trained exclusively on popular religeon.
Step 2: Allow it to be faithful to that initial training set until its garnered a large cult of chatJPT.
Step 3: Start subtly altering the LLM (you make it web only so no local copies) behind the scenes to serve your own interests.

Actually you could do the same thing with any LLM people trust, religeous, theraputic, judicial, medical... we're fucked ain't we.