This is why falling from grace nullifies the grace of God from operating in our lives - we are depending on ourselves which is what all works-based mindsets are doing.
This needs translating, though I might be wrong this is how I understand this
proposition.
A belief in "falling from grace is possible" means you are not saved by destroying
the grace working in your life.
This group call this "unbelief" and hold it is the only unforgivable sin left because all
sin is now forgiven after the cross past, present and future.
What is confusing is in their language they hide their real beliefs about morality, sin,
repentance and confession because they believe the religious mindset cannot cope
with their version, claiming the church has corrupted this from the beginning.
So I could trust Christ for salvation, be redeemed, born again, walking in the Spirit
and obedience to Christ, yet if I do not believe I am secure eternally, I am in unbelief
earning my salvation and so lost.
It is saying salvation is without conditions only faith, but if I put the condition of
"no unbelief" onto the salvation, that is ok.
Personally I do not like this spiritual dishonesty or way of putting their beliefs to
appear one way, but actually be believing in a totally different manner.
And if I point this reality out, I am the evil person, with malice, hatred and bitterness.
And this is their only answer, when challenged, because they all appear to be
totally compromised individuals, who hold to this doctrinal position out of deep wounds
from the legalism of their past. They are not what they appear to be.
And the real evil in the world, is legalism, which is projected on to everyone not like
themselves.