Some cults, as portrayed in cinema, are much more believable than others. The cults in “The Invitation” (2022) and “Midsommar” (2019) are definitely more realistic than the cult in “Race with the Devil” (1975). Hell, the Oompa Loompas are more realistic than the cult in “Race with the Devil”.
If you’re searching for a horror film with a believable cult, then look no further than 2017’s “The Endless” which contains the portrayal of cult so authentically that you’ll feel like you’re about to be offered a free personality test.