Well, this Baptist believes that is exactly what Jesus was talking about in the "Judge not..." passage of Mat. 7. Whether one was never saved is God's business not mine and whether he has committed a sin so much as to show they were never saved is God's business. Worry about your own soul in this regard. When it comes to your brother just forgive (7x70) and let God take care of the rest. This does not obviate the need for Church discipline for those engaging in open sin, nor does it prevent the church from taking back such a one who has repented and left that sin. Again, why would God save someone he knew he would have to unsave a few years down the line? Or do you not believe God is all knowing?
While Jesus said “Judge not lest ye be judged,” He also said for Christians to “Judge righteous judgment.”
It comes down to this: Calvinists and Baptists think they can sin just about as much as they want to while telling others and themselves “I really did some really, really bad things but I was still saved - just out of fellowship with Jesus.”
OSAS is an excuse for sinning just about as much as you want to, no matter how bad the sin is, or at least don’t do too much (or at least don’t get caught) because the leadership in the church might say you were never saved to begin with (falsely saved). But rarely do they ever pull out the “You were falsely saved” and affix it to anyone as I know quite a few Baptists and they just won’t do this to another Baptist.
Now, if someone who was supposedly saved and gets caught in homosexuality, then they will get the “falsely saved” label. But let some Baptist commit adultery 3-4 times over a few year period and other Baptists will say that person was in and out of fellowship with Jesus -— but still saved.