Jesus prayed (Jn 17:21) that “they may be one in us as you are in me and I am in you.” (Easier to comprehend if in means in union with.) This is the original sense of at-one-ment. “We also joy in God through our Lord Jesus Christ, by whom we have now received the atonement.” (Ro 5:11; KJV uses atonement)
Our sins have put us on a path different from God’s. “Give ear and come to me; listen, that you may live. I will make an everlasting covenant with you,” (Isa 55:3a,b). "This is the covenant I will make with the people of Israel after that time," declares the LORD. "I will put my law in their minds and write it on their hearts. I will be their God, and they will be my people.” (Jer 31:33) God certainly takes the initiative, but if atonement brings God and me together, it is I who must change, not God.
Paul alludes to at least 10 different aspects of God’s activity in the atonement. Three major theological attempts to explain it involve Jesus and the Father; one even involves the devil. But none involve me, and the picture they suggest of the Father does not fit the image that Jesus gives us. A fourth explanation, first proposed by Peter Abelard in the mid-1100s, is sometimes called “emotionally responsive”. Abelard declared that God, Jesus, loved us so much that He called us through the compassion of our hearts, from the position of an innocent man dying an unjust death. He phrased it: “Love answers love’s appeal.” I don’t know how to explain this to someone.
A covenant is an agreement between two or more parties. If I am not involved, am I still a party to the covenant of atonement? Verses like “God hardened Pharaoh’s heart” (Ex 4:21, 9:12) make me wonder, did God soften my heart? Without my cooperation? I can think of three verses, other than Paul’s, to ponder: “Go and sin no more”, “Love one another as I have loved you”, and “And what does the Lord require of you? To act justly and to love mercy and to walk humbly with your God.” (Mica 6:8)
What verses (or wisdom) from the Bible might support the idea of a continuing covenant, with my involvement, rather than a one-time event, without my participation, with regard to the atoning death of Jesus?