"I will show my love to the one I called 'Not my loved one' I will say to those called 'Not my people', 'You are my people' and they will say, 'You are my God'."
Originally this verse is taken in the context of the election of Israel over all other nations, however now all who were non-elect have access to this God who takes for himself a people to worship him eternally because Christ. God's purpose for us, then, is for us to realize the glory he has given us in causing us to be elect in Christ.
And this realization is not a "choice". We don't choose to recognize if our houses are on fire or not. We could deny the reality but our houses will burn down regardless. Our job as Christians is to tell of this glory and grace that all might recognize the world as it truly is.
Everything God does is so that he might be revealed to us as God. God has, throughout history, revealed himself through Human instrumentality. He has revealed himself through the history of the Jewish people as preserved in the Old Testament and through the humanity of Jesus Christ, the image of the invisible God, and now through his Church, the Body of Christ in the present age. He lifted us up out of our sin. Once you realize the totality of the grace you have been given, you will be brought to faith by God.