This verse can be extremely confusing to someone. But fallen away means to lose belief, and we already know that Paul has stated, IF it were possible, well, once we are saved, we do NOT lose that belief. If one were to lose that belief, they were not saved to begin with
There is miss understanding of repentance and saved;
When we repent, here on earth our status is...repented.
When G-d passes judgement on us after death..we are saved...and no one can take it away from us.
If we say we are saved while alive here on earth then G-d has no power to condemn us upon His review of our righteous life while on this earth. That's non sense.
What is the appearance before the judgement seat of G-d for?
The Bible tells us in many ways that we can loose our repented status...including the loss of the 5 crowns that we could be awarded.