Every Christian I’ve met who believes they can lose their salvation has always given a reason that involves them. What if I commit suicide? What if I get a divorce? What if I stop believing? What if I…? You fill in the blank there, but it’s all the same. Every hypothetical scenario puts ourselves at the center of the equation. But our faithfulness to God is an old-covenant problem that is solved by the new.
Andrew Farley
God Without Religion, Baker Books, 2011, 30-31
GraceQuotes.com 
Writing to Galatian christians Paul said Gal 5:18-21. Maybe the apostle of grace shouldn’t have said it but he did.
Writing to believers in Galatia he warned them in Gal 5:3-5
I testify again to every man who accepts circumcision that he is obligated to keep the whole law. You are severed from Christ, you who would be justified by the law; you have fallen away from grace.
Clearly in context he’s talking to his converts. You cannot fall from grace if you’ve never been in it.
Seems like the only interpretation of this is that they were saved, but became lost and severed from Christ. Again you cannot be severed from one to which you have never been joined.