GOD'S ELECT
There is no indication anywhere in Scripture that when a man or woman first believes in Jesus for salvation, God says something like, "Oh, look! We hooked another one! Get out the book and write his name down!"
God is not taken by surprise, God is not waiting for people to believe so He can jot their name in the membership role of Heaven, and He isn’t keeping some running tally.
All who are His chosen ones, all of His elect from eternity past, are in this book. No one else is there, and no one in it can or will ever be removed. That is the teaching of the Bible.