God does not need to sacrifice anything. He could create anything he like by wishing it.
Jesus, a great teacher who understood the spiritual universe, wanted to make huge impact on mankind with a statement of love. Jesus asked for this opportunity and God granted him.
Jesus had the power and God's permission to walk away from the crucifixion at any point.
God will never impose such a thing on Jesus and anyone. God Almighty is very capable of saving mankind without any help from Jesus. They are those who believe that God Almighty needs some one else like Jesus to save mankind.
These groups have no idea who God is or cannot fathom God infinite powers. This is purely a Christian myth.