Jesus said very emphatically in John 6 that no one can come to the Father unless the Father draws them to Himself. This is very puzzling for many people. How should we understand it?
When someone chooses to believe in Jesus Christ as Savior (the Messiah), he or she does so only in response to the urging of God's Holy Spirit. God does the urging; then we decide whether or not to respond to Him. It's really just that simple.
Belief in Christ is not natural. It is supernatural. And none of us has the ability to believe unless we've had this urging or drawing or calling of the Holy Spirit to do so. In other words, no one is pre-disposed to believe unless the Holy Spirit Himself pre-disposes them.