St. Thomas Aquinas is perhaps the greatest proponent of this perspective. Metaphysical language is meaningless. Only propositions which can be empirically verified have meaning. This is the position of the Logical Positivists. A. J. Ayer and Rudolf Carnap held this position.
Religious language is moral discourse.
Language about God is really language about how people should behave towards each other. R. B. Braithwaite, Immanuel Kant, and Albrecht Ritschl all held this position. Wittgenstein argues that speaking a language is a kind of activity. Paul Holmer and Paul van Buren hold this perspective. Religious language is metaphorical and symbolic.