My understanding of prevenient grace significantly impacts my view of the unevangelized. I believe that prevenient grace is extended to everyone in the world. If one responds to prevenient grace, no matter how far removed he is from missionary influences, God will give him (or her) more light and grace. This grace can eventually enable the seeker to exercise faith in Jesus, even if the seeker doesn’t know the name of Jesus, or even if God has to send a missionary or angel to reveal important truths to him. God will save anyone who seeks the one true God of creation with his whole heart (Jeremiah 29:13).
No one will stand before God and truthfully say that it was impossible for him to find the true God and trust in Jesus. If someone is not a seeker of God throughout his life, he will realize when he stands at the judgment that he could have begun to seek God and would have been given sufficient special revelation (at least enough to exercise implicit faith in Christ) if he had been a genuine (and persistent) seeker of God.