1 If you what to afirm that it is incoherent, then the burden proof is on you
2 if you what to claim that it is impossible, the burden proof is no you
3 I woudl love to do that, share your favorite explanation and lets see which one is better based on explanatory power, explanatory scope, parsimony, etc.
Think this through for a minute:
- if nobody made any arguments at all, we'd be at "maybe the universe had a designer; maybe it didn't. We don't know."
- you come along and say "no, no - the universe definitely did have a designer. Here's how we know."
- but your chain is only as strong as its weakest link. Your argument's conclusion is no more certain than your most doubtful premise.
- this means that even if there's any reasonable doubt about any of your premises, all you get is "we don't know," but you already had this at the beginning.
- IOW, it's not necessary to demonstrate that your premises are necessarily false for your argument to fail; it's only necessary for them to be doubtful.
- IOW, you most definitely have the burden of proof.
... so unless you can actually explain how the concept of a "designer of the universe" is coherent, your argument dies.
So please: explain to us how "design" would work in a spaceless, timeless context beyond the universe. The explanation is either coherent or incoherent, and as long as we can say that it
might be incoherent, then you haven't established your conclusion.