Christ was Plan A, not Plan B. Atonement implies that God had a plan, we messed it up, and then God had to come back in to mop-up our mistakes.
Jesus did not come to change the mind of God about humanity. It didn’t need changing: God has organically, inherently loved what God created from the moment God created. Jesus came to change the mind of humanity about God. This sets everything on an utterly positive foundation. Rather than being an ogre, God is Love. Rather than being sinners in the hands of an angry God, we are inherently and forever loved by God, no matter what we do or don’t do.