The burden of proof is with the claimant. If it were the other way around, we'd be disproving every crazy-assed thing someone came up with. Was John Wilkes Booth possessed by demons? Up to you to prove he wasn't. Was the Hindenburg brought down by a UFO? I don't know, prove it wasn't.
It's not up to skeptics to prove a god doesn't exist, it's up to believers to prove it does.