A perpetual motion machine which is what you seem to be suggesting is not a natural thing definitionally.
The universe, as we understand it, is that 'perpetual motion' machine - the heat death of the universe is not when the energy has all gone away, it's when it has spread evenly all across space. That energy cannot be destroyed, it cannot be created, it can only be changed in form. Energy is already 'perpetual', and it's one of the underpinnings of what is 'natural'.
We know energy is not created or destroyed but there is the issue of entropy, useful energy and heat death.
And, within the larger cosmos, the extra-universal physics, even if we presume that the same rules continues that energy can neither be created nor destroyed, we can still posit that there are eddies and currents within that energy, just like we have in the universe. They have a long-term tendency towards dissipating and levelling out, but something had to happen to accumulate a 'clump' into our universe, who knows how often that might happen, what might cause it.
If the universe exists perpetually then what is it about the universe that keeps it going?
The universe may not be perpetual, we're reasonably confident that it had a definite start point - the cosmos beyond that, though, who knows. If energy can't be destroyed, why shouldn't it be an eternal shifting sea?
Shouldn't it have experienced heat death sometime in the infinite past?
Maybe, yes. But maybe there are other traits that we haven't witnessed yet.
There is still no answer as to why it exists rather than doesn't.
If that question makes sense, and I'm not sure it does, doesn't it apply just as equally to a creator deity? Why God and not 'not God'? Why 'that God' and not a different one?
Your statement that the universe is not transportation is a denial of the principle of analogy.
I didn't say it wasn't transportation - although I note that the elements of it that are transportational aren't the elements to which you were referring - but rather that as an analogy goes it was... lacking.
You've made a lot of assertions of what can and can't be with precious little justification.IMHO.
Because, and I can't believe this needs to be said yet again, but here we go: I'M NOT MAKING A CASE. I'm positing possibilities that undermine the claim there must be a creator because there is a creation. Repeatedly I get told that there has to be an uncaused cause, a prime mover, the first little choo-choo (to borrow a shit analogy), but very little explanation of WHY. Just 'infinite regress', as though giving it a definition constituted an argument. So I suggest the possibility of an infinite cosmos - I don't need to 'prove' it, I just need it to be a possibility in order to the job of showing that you can't even show that there's necessarily a creation, let alone a creator.
Potential energy needs to be actualised
Physics - indeed, the thermodynamics you were so keen to cite earlier - put pay to that Aristotelian view of energy centuries ago.
O.