There are at least two types of “falling away.” The ones who were pretenders and “believers of convenience” were likely never effectively born again to begin with. The falling away of those who professed a convincing commitment to the gospel is a completely different animal, and is the one referred to by scripture.
These are the Evangelical pastors who later “come out as ‘gay’” and are now ardent apostles of Satan. We are seeing that more and more now.
It is our great error to confuse the two.
Your two descriptions are just parts of the overall spectrum of individuals who say/believe they are Christians, but are not Spirit-born true regenerated pardoned (= “justified”) children of God, who cannot and will not ever “fall away.”