I'd say the OSAS's will confront issues with their logic because what do you tell an atheist? An atheist will say "Hitler was catholic, so he still went to heaven after all he did?". OSAS's say "He was not saved to begin with!". There in lies the issue. You can't say OSAS then say someone is not saved since the start then. It makes it look like you don't really know. And to a non-believer it makes christianity look like a joke.
Especially since the bible says when you let Jesus in, you are saved. But you are saying "Oh, that bad person, he never really let Jesus in!". This is why saying OSAS isn't accurate at least appeals more to non-believers. We should be more worried about what OTHER people think instead of what other christians think. The outsiders are the ones we are trying to reach. All the fighting we do amongst each other is why they say christianity is a joke.
Also I'd add that many OSAS's tend to be very aggressive, sarcastic and super "holier than thou". Since that is the case.... maybe you weren't saved to begin with. But like it says in the bible you don't realize it until you stand before Him and He says "Go away, I do not know you!". If you are hurt by this, I am simply going by your logic. See how it doesn't make sense.
This is a subject I don't know and don't think we either can or even are ever supposed to know, because it is up to God and is between God and that person, alone...
But Men think they are the judges of such things, and therein lies the problem...
So then, what options are we left with, and what do we tell people...? that there is a "chance" they could lose or lose out on their salvation, or whatever, or not (tell them that), or tell them otherwise, or whatever...
I simply tell them I'm not their judge... Is there a chance that they are not saved or whatever, if the subject comes up, I tell them I do not know...? I tell them that only they can answer that (for themselves)... or perhaps they can get that answer but "only for themselves only" from God directly, "if" he chooses to reveal that to them that is...
Take this from the all ever omniscient one's perspective of point of view, if one is a child or one is young, does not that God "already knows" if they are saved or are going to saved in the future, ect, or whatever, or whatnot, and do those terms even apply to Him or have any meaning with Him...? They do not... To Him they are either saved (or going to be saved) (again "terms" that do not apply) anyway, to Him they are either saved or not saved, and He knows and knew this (about everyone) (but you) long before you were ever created or even thought of, to Him or that One, there is no such thing as being saved one time, then losing it at another time, ect, That is our perception and He doesn't, and maybe even "cannot" even, see it that way... From His point of view, one is either saved or they are not... Then you might say or consider, and what if someone has times of periods of faith in their life, and then periods where they did not have faith or were not faithful to the faith, ect, and went back and forth, so to speak, can you judge where they "landed" so to speak...? Well, can you...? Oh, I know "as long as it was before they died" your gonna say now, right...? Well, why does it have to be, or why do they have to be in faith before they die, and that is all that matters...? what if they were faithful most, or if not all of their life, or at many other times in their life, or were faithful most of their life, just not near the end, anyway... Your the judge are you...? And, are you really...?
God Bless!