They attend his rallies and are inspired uplifted given hope by his sermons. They are in fact attending church so it is most holy to them. Like any preacher or minister or reverend or Father he ministers to them, cares for them, listens to them, prays for them and always instructs them. They are devoted to him and treasure every word he says. Admittedly he repeats the same words incessantly endlessly but they are comforting words that fill their hearts minds souls with hope of a better tomorrow. They live in the world of an alternate reality and their GOD in that reality sent donjohn to save them. They will never abandon him. He is the light the way the hope and the truth. For millions. The sanctity of a church comes over the open-air arena. He speaks in whispers. They listen attentively. They are one with God in donjohn's presence. So you see there is no way they will ever abandon that. You can understand why now can't you?