If robust moral practice is empirically possible without postulating God, then God is not a necessary rational presupposition of the moral life but merely one optional metaphysical supplement among others.

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empirically possible(asking whether something is practically achievable): Something that can actually happen in the real world based on evidence and observation, not just in theory.
metaphysical(Ayer's Logical Positivist usage): Language that purports to refer beyond the physical world and lacks empirical consequences, which Ayer classifies as not literally significant
necessary rational presupposition(questioning whether God is required for morality to work): Something you have to assume is true in order for something else to make logical sense—you can't reason your way through without it.
optional metaphysical supplement(suggesting God is one choice among many, not a requirement): An add-on belief about non-physical reality that you can choose to accept or reject without breaking the main system.

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