I sympathise with Beth's distrust of anybody relying on their own preferred "null hypothesis" as an argument.
Unlike some of the "strong atheists" my atheism doesn't rely on any null hypothesis or Occam's Razor, as my reason for saying that any ideas of a god or gods are not even worthy of consideration.
Here, I shall typify that position as a guy called Occam, who hates "unnecessary" complications. I admit I exaggerate his position a bit, as a straw man, to make my point.
I have even less respect for my other straw man, the theist who follows any of the 2000 year old religions, or any of the New Age fanciful notions. I'll exaggerate him too a bit, as a straw man I call the Creationist. In that camp I include punshhh's vague and ever shifting ideas of "god" (which are as hard to catch as soap in a bath).
The third way is my hero Agnos. I don't mean any of your favorite definitions about what "agnostic" should mean. His position is this:
"On closer inspection, nature and the universe always turns out to be more complicated than we had previously imagined, but is never complicated in the particular ways we had imagined it would be.
Also, with scientific progress, the most realistic explanations never turn out to require a god."
Three examples:
1: Termites
Before we had microscopes, we knew nothing of the termite's digestive system. Occam would imagine the termite just uses strong digestive juices which can dissolve wood. That would be simple and sufficient. The Creationist would believe there's a spirit being with five fingers and exactly seven green eyes inside the termite, performing the *miracle* of digesting the indigestible. Agnos would say: it's probably very complicated but I'm not going to guess how.
As it turned out, after inspecting with early microscopes, we found each termite has multicellular critters in its gut, who co-evolved with the host. With even better microscopes we discovered unicellular critters inside those symbiotic passengers' guts. It was like a set of three Russian dolls.
2: Volcanic vents in oceanic chasms
Before deep robot submersibles explored there, Occam would have assumed nothing could live in such conditions. The Creationist would have imagined fairies with pink dresses. Agnos would have said: it's probably complicated but I'm not going to guess how.
Now we have filmed evidence from submersibles, I'll leave you to look up the wondrous ecosystems discovered down there recently.
3: Quarks and quantum theory
Early in the 20th century we had a neat model of atoms being the smallest particle. Occam would have loved that model. Then to Occam's dismay we found subatomic particles - and the field is now so complicated with string theory etc, I can't even read about it all or understand the specialists. Needless to say, our Creationist's imaginings were way off the mark. Agostic was the only person who wasn't wrong, as he made no claims which he could be right or wrong about, neither too simple nor too detailed.
Conclusion:
Detailed fanciful explanations requiring an intentional creative god always turn out to be untrue, when we see how things seem to be getting along just fine without one.
But Occam's Razor is NOT the way to refute the explanations offered by religion. It is not a natural law like the first law of thermodynamics, or the theory of natural selection.
Nobody has ever claimed Occam's Razor is a natural law, just a guess, a good bet, that the simplest answer is probably correct. But it often turns out to be untrue in nature.
The religious person's distrust of Occam's over-simplifications ("nothing to see here so move along") is a good instinct. Scientists do keep discovering ever more layers of complexity (just ask weather forecasters). But the religious fools replace Occam with faith in the prettiest and most attractive idea. They don't want us to be alone in a heartless universe which doesn't care a damn about us.
But those new and always surprising complexities are always consistent with simple laws which we have rarely needed to extend or add to (recently: chaos, quantum and relativity theories have added complexity to Newton's simple mechanics which still hold true at certain scales).
That's why I called the hero of my story Agnos, not Agnostic. He says "I don't know how it all works, and I don't expect it will be the simplest possible explanation, but so far it has never turned out to be magic."
Theists have been in constant retreat, from advancing science, having now abandoned any right to explain biology (except for a few fundamentalist loonies) or geology or the age and development of the solar system, they have now retreated to the outer edges of time and space itself.
Punshhh is an amusing if pitiful example of this, cowering beyond the reach of natural science, in the mysteries of the ether before the big bang. "You can't catch me here. There could be a god out here at least."