What is the main message of God's doctrine?

The core of God's doctrine is the proclamation of Jesus Christ and His redemptive work on the cross. As Moses conveys in Deuteronomy 32, God's teaching reveals Him to be our foundation and refuge, with Christ being the ultimate fulfillment of this doctrine. All Scripture, spanning both the Old and New Testaments, consistently points to Christ, as noted in Luke 24:27, where Jesus explains the Scriptures concerning Himself. Therefore, the essence of God's doctrine is not merely abstract truths but is rooted in the personal work of Christ who offers salvation to sinners.