You are making the hypothesis of abiogenesis into a proven fact even before it has been proven.
I don't think I did. What I said was, "If abiogenesis can occur, like every other chemical process, it will occur whenever the conditions are right for it, like ice melting," and, "Life is synthesized from chemicals every day, and it occurs in living cells without intelligent oversight. It is obviously just a matter of arranging the right ingredients in the right milieu. They bind together of their own accord." What didn't you like about either of those comments?
So all you need to show is that [abiogenesis] happened once.
I think the best that can be hoped for is to show that abiogenesis is consistent with the known laws of chemistry, and that it could have happened.
I was refuting the claim that because it exists on earth that means it does exist elsewhere. That is a claim that life did begin without a life giver.
I don't recall seeing that claim. Virtually everybody claims that we don't know of any life existing anywhere but Earth. And why argue that point anyway? Refute the best arguments if you can. The presence of life on earth is good evidence that life might be found elsewhere however life arises.
The argument that all life comes from previous life has already been rebutted. I believe I rebutted it for you recently. You believe that there is life that didn't come from other life. Is your dod alive? If your answer is yes, then your god is life that didn't come from other life. Do you consider disembodied mind not living? Then the life it created is life from nonlife.
you end up denying the evidence for God by saying it cannot be studied by science.
All evidence can be subject to critical analysis. If something cannot be studied empirically, claims about it are not falsifiable, and it can be treated as nonexistent. Evidence previously offered as supporting a god belief has been rejected as sufficient to support belief according to the rules of inference (reason). This includes scripture and other testimony, nature itself including living cells, and assorted arguments from the Middle Ages.
science works with the presumption of no supernatural intervention.
I've studied a lot of science. No professor, textbook, or other source for science knowledge made that claim. The word supernatural doesn't appear in the sciences to my knowledge. God don't appear in scientific theories not because they are excluded, but because they add nothing to the explanatory and predictive power of any scientific theory.
Furthermore, as with many other religious concepts such as design, macroevolution, the kinds, and gods themselves, supernatural has no clear, distinct meaning.
But you seem to like the idea that lack of evidence for God in the sciences shows that God does not exist and that life must have come from chemistry and physical processes only. Science does not claim that life comes only from natural processes. That hubris comes from atheists who misuse science to try to show that science is on their side.
I think that "hubris" comes more from apologists transforming the arguments they see into the ones they prefer to rebut. You keep listing things that most of us neither claim nor believe. I do not claim that gods don't exist, and neither does anybody else who calls himself an agnostic atheist. I have never claimed that abiogenesis has been shown to be correct, and I don't recall reading that from anybody else, although it wouldn't matter if I had, just as it doesn't matter that some atheists deny that gods can or do exist. Lack of sufficient evidence to believe in gods is reason for the critical thinker to not agree with those who choose to believe in them.