They never valued GOD as He should be valued. Thus, they said, "GOD does not reveal anything to any human being." Say, "Who then revealed the scripture that Moses brought, with light and guidance for the people?" You put it down on paper to proclaim it, while concealing a lot of it. You were taught what you never knew - you and your parents. Say, "GOD (is the One who revealed it)," then leave them in their heedlessness, playing.