Agreed, but if the answer is that it is eternal, then we get into problems. Where did it arise from (just like the arising of God/Gods)? Where did it come from?
It is not the question of 'putting the onus' with this party or that, it is a simple question of finding out. It is a question of science and not of philosophy. Philosophy has taken us this far and cannot take us any further. Nobody denies the present existence, though we can certainly discuss its apparent appearance, perception. Some may say that what is perceived is true and others may say that what we perceive is not true. Saying that existence cannot arise from non-existence or cannot become non-existent again in a similar way is taking a position without proof and without logic. Perhaps it can. Mathematically, as with a flat universe scenario, there is no problem.