The central message of this sermon is that Jesus Christ's deity and supremacy are essential to a correct understanding of God and salvation, and that any attempt to dethrone or diminish Him results in heresy. This idea advances the belief that Jesus is not just a good teacher or moral example, but the very Son of God who deserves worship and reverence. The takeaway the teacher wants listeners to understand is that when we begin to compromise on Christ's deity or supremacy, even subtly, it can lead to a distorted view of God and salvation, which can have far-reaching consequences for our understanding of the Christian faith.