I agree that one cannot “lose” salvation but if one cannot willfully abdicate then who are the cowards of Revelation 21:8, hmm?
But the cowardly, the unbelieving, the vile, the murderers, the sexually immoral, those who practice magic arts, the idolaters and all liars–they will be consigned to the fiery lake of burning sulfur. This is the second death.” – Apostle John by Revelation from Jesus, Revelation 21:8
Remember: Judas was counted among the 12 before turning on Jesus.
That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place. (Acts 1:25)