I believe you mistake what makes one a Christian. It is the "new birth" this is the dividing line. Without it one is not a Christian, with it, one is. One can not be "unborn again" no more than someones child can be "unborn again" for that life has been started.
Ok, lets take that little convincer and break it down. With physical life one cannot be born then unborn, or can they...they can cease to exist, meaning they are no longer there, just as though they were unborn. But even that is beside my point, they are two different things, and though we can't go back into the womb, that would be physically impossible, it is physically possible to throw our salvation away by not being obedient. So pleas don't let your analogy there make it seem impossible, that just some little trick the one we call Satan likes to use on you, but you can buy it if you like...always up to the individual.
Generally the only people that buy that we can do as we like after salvation, is the ones that prefer to do what they like, and not what God says they must do.
See, what you are saying is we can work iniquity and remain saved when you know perfecly well what Christ said to those who did not do his/Gods will.
And then will I profess unto them, I never knew you: depart from me, ye that work iniquity. (Mathew 7:23
And on this
"they would not have left us if they were one of us"
Of course they wouldn't, but they became not one of them and left them. You just have it somehow in your mind that they never were one of them when that is not what the scripture says, only what false teachers tell you (the ones that want you to misunderstand. It's kin to your "They never were saved to begin with" comeback that does not and never did hold water.
But this is off topic here, besides, it has been debated to death so find those debates if you like, or start your own thread, and I'll be happy to comment.
