Finally we get to God's respect of freewill. He won't force us to accept Christ. After all, we weren't created robots. Using the same reasoning God won't ever force us to keep His gift of redemption. We always have the choice.
Christians know once they are saved, their names go into the Book of the Lamb.
However it's possible for God to blot out a name. Now consider some others who were condemned. How about the sinner of the sinners, Satan. He was perfect. He sure wasn't lost because God put him second in command.