Choosing to salvation does.God chose the nation of Israel, the Jews to obey follow and obey Him yet they failed. God choosing doesn't equate to following Him.
The Jews were not nationally chosen to salvation, but to God's called-out assembly.
Those chosen to salvation follow him.
Those who believed in the Promise (Ge 15:5, seed; Jesus Christ, Gal 3:16) were regenerated.They disobeyed Him and followed after foreign gods. That was an act of their wills to disobey Him. Their hearts turned towards the false gods of the other nations. So just because God chooses a person and they are "elect" just like Israel does not mean a person is saved.
So were they regenerated in the O.T. or not ?