The assumption that the creationist actually buys "creationism is true iff omega believes it's true" is by far the weakest aspect of this scenario. As always, I just assume that Omega has some off-screen demonstration of his own trustworthiness that is Too Awesome To Show

(insert standard 'TV Tropes is horribly addictive' disclaimer here)

For the same reason, I've often wondered what a worldwide prediction market on theism would look like, if there was any possible way of providing payouts. Sadly, this is the closest I've seen.