The real test of whether someone is in the cult or not is whether they believe that the 2020 election was "rigged" or "stolen." Trump HAS to believe that, because his Narcissistic Personality Disorder cannot allow him to imagine that he is a loser. At anything, any time. So he didn't lose the 2016 Iowa caucus to Cruz - it was rigged. He didn't lose the Emmys all those times. They were rigged.
Anyone who believes that the election was rigged is in the cult, and beyond help. No amount of evidence or logic will help them.