At the same time, those who answered the call still have the opportunity to reject. Case in point, Judas chose to betray Christ, and seemed to not repent, whereas Simon Peter denied Christ and then repented. If the grace was irresistible, how were those two able to then reject it, even if temporarily in the case of Simon Peter?

The analogy of Lazarus in the tomb is not suggested by the Scriptures, though because Scripture is used to make it, people seem to find it compelling. I believe it is incorrect.