"Every age has its own characteristics. Right now we are in an age of religious complexity. The simplicity which is in Christ is rarely found among us. In its stead are programs, methods, organizations and a world of nervous activities which occupy time and attention but can never satisfy the longing of the heart. The shallowness of our inner experience, the hollowness of our worship, and the servile imitation of the world which marks our promotional methods all testify that we, in this day, know God only imperfectly, and the peace of God scarcely at all. If we would find God amid all the religious externals we must first determine to find Him." (Tozer, The Pursuit of God, Kindle Locations 128-133)
We don't need to promote God, right? I mean, if it's really God that shows up and inhabits the house, the word will get around just fine without advertising. The presence of God advertises itself. Focus on God's presence and your church's advertising budget will shrink to $0.
You don't have to advertise a fire.