I can’t be bothered getting into a debate on this forum, but I think there’s a strong element of Trump supporters who act in a highly cultish manner. Rigged elections, Qanon etc. If any Republican leader now criticises Trump, their popularity will plummet and their integrity will be questioned and accused of being deep state elitists.
I would say the analogy fits, as it would with Corbynites, Scottish nats, FBPE supporters, Johnsonites etc. Of course some who support these are not so hardline, but that doesn’t take away the cultish element of their fanbase.