For if, while we were God’s enemies, we were reconciled to Him through the death of his Son, how much more, having been reconciled, shall we be saved through His life! (Romans 5:10)
The cross of Jesus Christ is essential as it offers us forgiveness and reconciliation to God. But it is Christ’s resurrection that actually saves us, enabling us to be born again with new, resurrection life in Jesus.
Hence the message is not actually the cross but the kingdom of God which is his reign in us as the reigning king .
For if I cast out devil by SPIRIT OF GOD then the kingdom of God has come into you (Math 12:28) and the spirit didn’t happen at the cross but after resurrection , which is the release of his spirit .
For the kingdom of God is not meat and drink but righteousness, peace and joy in the Holy Ghost (Rom 14:27)
Just a thought !