I've not heard that expression, cafeteria-style. I've always called it,"Burger King Religion", that is , "have it your way". LOL
It's Cardinal Ratzinger's (Pope Benedict) term...as in "the cafeteria is closed."
Off topic, but reminds me of the immortal benediction from "Karnak the Magnificent" (aka Johnny Carson), who prayed, "May your wife be like Burger King and let you have it your way!"