One of the signs of a cult is that they will continue to use long-discredited arguments, with no indication that they acknowledge or have even SEEN numerous criticisms of those arguments.
Religious apologists continue to use Thomas Aquinas' First Mover argument and Pascal's Wager, centuries after they were debunked, with no attempt whatsoever to update those arguments to even try to address the debunkings.
Creationists continue to use Hoyle's junkyard 747 argument, the "no way for the eye to evolve" argument, and their horrific misinterpretation of the second law of thermodynamics, decades after they were taken apart, again with no effort to update those arguments to account for the debunkings.
NRA apologists continue to use their "a well-armed society is a polite society" and "millions of defensive gun uses every year" and "gun-free zone" arguments despite numerous public debunkings, again with zero effort to address those debunkings, or any indication that they're even aware of them.
Global warming deniers continue to use cherry-picked numbers to pretend there's no warming trend and no glacier melting trend, long after their misuse of statistics was pointed out. They continue to pretend that the temperature correlation is the ONLY evidence of the CO2 greenhouse effect, as if the lab tests confirming this mechanism were never conducted, no matter how many times you point this out to them.
Conservatives who pretend that "cancel culture" is a mostly liberal phenomenon never adjust their arguments after you point out example after example after example of conservative cancel culture to them, going back decades.
It's not just ignorance either: it's deliberate dishonesty. If you come armed with evidence and argue with one of these people to the point that he stops trying to defend his claims, you can reliably expect to see that same exact person using those same exact arguments a week later, to you or someone else, with ZERO effort made to update those arguments to respond to what you showed him.
Honest people can be reluctant to admit when they're wrong, but they will at least TRY to address criticisms. Cult members don't bother. They will just act as if they've erased your criticisms from their memories. It's one of the most consistent cultish behaviours that I've seen.