In Pastor Ken's sermon on being transformed by your identity in Christ, he emphasizes the importance of identifying with Christ and the new identity that comes with it. He talks about the transformation from being in Adam to being in Christ, and the power that comes with using the name of Jesus against Satan. He also highlights the joy and fulfillment that comes from obeying the Holy Spirit and loving on people, and the dramatic transformation from being a child of darkness to being a child of light. Overall, Pastor Ken's sermon encourages believers to embrace their new identity in Christ and walk out Jesus's will on the earth with authority and joy.