What will fill the gap? In a lofty mood, one could dream of idealised greek polis-societies, working both the intellect and the muscles while having dialoguges on morality and other ideas. That would be a good kettle for the origin of morals, but knowing the world, something like or similar to scientilogy will probably fill the gap.

Just keep in mind, the church havent always been there, morality was "invented" outside the church, the church doesnt equal morality. (see my previous post on Nietzsche).