How essential is the trinity in understanding the atonement? Why does God need to kill anyone in order to forgive? Does true forgiveness require a payment or sacrifice?
How was Jesus forsaken on the cross?
If you don't believe any essential Christian doctrines, why would you call yourself a Christian?
What was God's motivation for saving man? A man-centered answer to this question destroys grace and cheapens the love of God. The true gospel humbles man and gives glory to God alone.