The sermon "Comfortable Christianity" launches the "Lukewarm" series by examining Jesus's sharp rebuke of the Laodicean church in Revelation 3:15-20, exposing the danger of half-hearted, self-sufficient, and useless faith that is "neither hot nor cold." Jesus stands at the door and knocks, inviting believers to repent, choose commitment over comfort, and go "all in" by actively pursuing a daily, fully devoted, faith-filled life.