—> Isn’t works-righteousness an aspect of every cult?
Yes. The cults are Satan’s Fashion Show.
Every so many years, a new cult arises that gets one or more of these wrong. They come into and out of fashion.
(Mormonism seems to get them all wrong)
There are only so many things you can pervert to keep people out of heaven:
The Gospel of Grace
The Godhood of Christ
The sacrifice of Christ
The existence of God
The character and attributes of God
God’s Triune nature
The inspiration and sufficiency of Scripture
Etc.
One way to get them wrong is to add to them or substitute something else, or to change them..
Some cults will argue on the means to be saved, to be given eternal life, such as the Catholics teaching eternal life is ONLY something that comes after death and/or a stay in Purgatory. The SDA cultist argues that faith is the means to salvation and one receives salvation by Grace alone, but the issue of eternal life is a muddy area which hangs in the balance of one's behavior after receiving God's Grace.
Since I want to choose my words carefully in this issue, I will pause here for the above assertions to sink in for readers. Then I will continue with much more that God's Spirit has ruminated in my heart for a few days. Expect cultists to jump in during the pause, to try and takeover the issue for the spirit that is impelling them, which spirit opposeth God's Grace. Going for coffee ...