Religion could generally, and only in a somewhat circular fashion, be defined as the determination of the subject by metaphysics. Metaphyisics, understood as the ideal elaboraton of being, or Being, means that this definition makes no essential distinction between the various forms of atheism, naturalism, materialism, scientism, utilitariarism etc., and the various cults called religions, or heterodox spiritualities. Some metaphyics are more flat or demotic than others, which are variously hieratic or baroque, optimised or aestheticised. This perspective answers to the intuition that becomes increasingly inescapable as we observe the various systems in contention, that they are all versions of pretty much the same sort of thing, grounds for more or less obnoxious forms of certainty. That leaves the only interesting quest, and it can hardly be called spiritual, as that for the authentic form of irreligion, which is no sort of belief, and certainly not a belief in unbelief.