Additionally, this grace offered to those who know nothing of Christ can be rejected just as you and I can reject His grace at our own last breath.
My sheep hear my voice, and I know them, and they follow me: And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand. My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand. (John 10:27-29 KJV)