Here I go again. What has Jesus NOT done that you would say I do not believe in ‘once saved always saved’? Maybe the question is what do you think Jesus really did? The Idea that deliverance of our sin as complete surly says that He did something.
Maybe think of it as all are “Reconciled to God” in other words, as opposed to thinking in terms of saved from afterlife destruction, maybe Christ came to try to assure those ‘AT THAT TIME’ were on the same page as him. Thus the saved verbiage is centered and exclusively for the first century. Forward to the current debate, yes Jesus was the path to a relationship with the Father, but the black and white imagery of heaven and hell is, well, should be beyond us.