“I am in charge of the process of Atonement, which I undertook to begin. T-1.III.1)”
This quotation simply places Jesus at the center. He is our way, just as we learned in the New Testament. We do not know when Jesus “began” the Atonement, but we know that he culminated the first part in his resurrection, a miracle that we can’t begin to comprehend (and Jesus does not spell it out for us in A Course in Miracles, though he never denies it).
And Atonement is a process, of this we can be sure. We add our parts to the Atonement, making a chain that will be unbroken, a chain that allows salvation for all. All will eventually find our way back, though it may take millions of years (Jesus says this). But as long as the process has started, we can rest easy, because the end is certain.
All return to God. All end the dream of separation, the illusory mad idea of a reality in which we have erroneously believed.
Do we have part in the Atonement, or did Jesus do it all? We do have a part, in that we have a part in salvation, and salvation and Atonement are very linked in our faith. Jesus’s part is to be our leader, at least for those of us who have agreed to see him as leader. He makes a choice to bring us all home to God, and we ourselves know that this is our crying need.
We owe a lot to Jesus. And he says that he will hold our hand on the way back to God.