Peace all...
Just my Opinion:
I dont think that the "falling away" from faith has anything to do with sinning.
We, as Christians, still sin daily.
Anyone who says he is free of sin, is not free of lies.
I believe that the "falling away" from faith will be from those who accept false prophets in the end. Many will come claming to be the Christ.
Those who know God's word will the know the true Lamb of God when He returns.
......
So, like I said. I dont believe falling away has to do with our sins; since we sin daily. I think it has to do with idoltry.
And it doesn't just have to do with accepting false prophets in the end.
During one's entire life, they can accept Jesus as their Savior. But in later years, turn to other gods, i.e money, porn, materialism, 1slam.
Just my opinion
He is Lord
Peace and Godspeed
Pray for Israel