I perceive that this very question is asked on behalf of those who doubt their salvation. Because of the false dichotomy (off/on binary, actually) created by the Church you end up with a lot of confusion. Mixed that up with some hard to understand Bible verses sprinkle on some fear and you have this very question, asked by thousands others, millions of others who are unsure of their present standing with God. Now, even if this isn’t a concern of yours, it is no doubt one of the top concerns people ask. You can see it all over the internet in the form of this question. Trying to find out if one can climb back out of the pit they fall back into, or maybe they are concerned for the future “What if I fall away?”
The premise is flawed entirely. You are not saved until you are saved, period. Until that time, you are working closer to it at the present moment, or working away from it at the present moment. Moment to moment, we backslide and move forward. Sometimes you hear 2 steps forward, one step backwards. We might even take 20 step backwards until we learn a specific life lesson. Maybe we keep trying to climb the wrong staircase, so we fall all the way to bottom and say “Hey, what is that over there? A different staircase!” and low, that might be the truth in that specific life lesson.
Life is hard, but religion makes it even harder! Even more so, these moments of doubt, of fear… They are but moments of emotional instability. They pass. They always do. But, sometimes they last a long time, perhaps long enough to have one question this false dichotomy in the first place.
One thing is sure: No one, absolutely no one is beyond the care and love of God. But all these words mean nothing to someone going through this. I have found this out… That no matter the assurance people offer on their opinion of a matter, or the proof they display; wherever the possibility for doubt to exist, it will and will destroy the peace you have. This something each person must work out on their own, else the OCD reassurance keeps the question going and going and going… Maybe this text will provide me the assurance I need… or maybe this one will… maybe the pastor can tell me something that will calm my fears… and the reassurance we seek never, ever, ends… That is, until we decide to stop seeking assurance and become comfortable with the feeling of fear, until that too, vanishes.