The trick is that you don't actually need to do it, as we already have the functional equivalent analogue – the development of countless different religions in the past, in different regions of the globe – as evidence. If at least one of these religions were right, you would've expected it to show up in at least more than one region in the past, but we can clearly trace all similar religions to patterns of human migration, which strongly suggests humans created all of them out of their cultural beliefs at the time