Thin end of wedge

According to 73 year-old Fr. Jeremy Davies, a priest, qualified physician and official exorcist in Westminster, it wasn't that naughty old scout master at all, but the devil himself, that turned you gay. He says: "Among the causes of homosexuality is a contagious demonic factor."

You can find out more here. He's particularly good on the relative dangers of thin and thick ends of wedges. But he would be, wouldn't he?