APAK, it's a heart issue and not a brain issue. :) Ezekiel gives us a crystal clear picture of how salvation works, and who does what in it:
"Thus says the Lord GOD... 'I will take you from the nations and gather you from all the countries and bring you into your own land. I will sprinkle clean water on you, and you shall be clean from all your uncleannesses, and from all your idols I will cleanse you. And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh. And I will put my Spirit within you, and cause you to walk in my statutes and be careful to obey my rules. You shall dwell in the land that I gave to your fathers, and you shall be my people, and I will be your God. And I will deliver you from all your uncleannesses.'" (Ezekiel 36:24-29)
For any of us, once God does this, then we will not fail to respond and thus choose the Right, and freely. Until then, though, we will not fail to choose, quite freely, the... left. :) As Isaiah puts it:
"Say to those who have an anxious heart, 'Be strong; fear not! Behold, your God will come with vengeance, with the recompense of God. He will come and save you.' Then the eyes of the blind shall be opened, and the ears of the deaf unstopped; then shall the lame man leap like a deer, and the tongue of the mute sing for joy." (Isaiah 35:4-6)
We are not "free agents"... not autonomous beings. To say that we are is a form of blasphemy, really, even if not intentionally so. Only God is autonomous ~ self-governing ~ and is thus sovereign over all His creation.
Grace and peace to you.