The title of atheist doth not only belong to those who deny the existence of God, or to those who contemn all sense of a Deity, and would root the conscience and reverence of God out of their souls; but it belongs also to those who give not that worship to God which is due to him, who worship many gods, or who worship one God in a false and superstitious manner, when they have not right conceptions of God, nor intend an adoration of him according to the excellency of his nature. All those that are unconcerned for any particular religion fall under this character.
—Stephen Charnock (DSM)