the MOST-DANGEROUS cults, the ones that lead more people to hell, are the pseudo/quasi-Christian ones that "have a FORM of godliness while denying its POWER", which is the Gospel of and by Jesus. they're so dangerous cuz they lead people to BELIEVE they're saved when they're actually NOT.
"Faith comes by hearing,(Hearing WHAT? Why, the GOSPEL,of course!) & hearing, by the word of God." (Spoken or written)
If you BELIEVE THE GOSPEL, that Jesus is the Son of God who became born as a human, was killed, & was resurrected by His Father after 3 days & nights, and is Himself God, & that He will save you from your sins if you call on Him in repentance & belief, then YOU SHALL BE SAVED. No religion can do that for you, and isn't at all necessary for salvation.
Cults are founded for nefarious purposes, under Satan's influence, for purposes of exercising control of many by one or a few, for money-making, for having a harem or other sexual sins, & for any number of other evil reasons, all invented by Satan. They might look good on the outside, but they're whitewashed TOMBS, full of death & decay inside.