Evolutionary theory is about the speciation process and the elements behind it (natural selection, mutation). The abiogenesis process is completely different.
Spontaneous generation is a historical, now discredited, scientific theory about the creation of large-scale life like flies and aphids. Abiogenesis in modern theory is the creation of autocatalyzing primitive RNA molecules from surrounding chemicals.
"Historical" indeed. Spontaneous generation had been posed since Aristotle, but was not discredited until Pasteur in 1861. Yet, microscopes able to see unicellular organisms had been available since Antonie van Leeuwenhoek (October 24, 1632 – August 30, 1723). So when you say "large-scale" life, you must intend "large-scale" to mean "on a cell to cell" level.
Science can be defined as the "systematic knowledge of the physical or material world gained through observation and experimentation." So let us start by saying the "speciation process" is observed and documented, and thus scientific. Let us moreover say "natural selection" and "mutation" are both observable aspects of a thoroughly observed and documented "speciation."
All is now observed, but I long to know what scientifically happened before that which we now observe and to that which we currently assent. If one attempts to retrace life's "evolution," one does come to abiogenesis. Yet, if spontaneous generation (historically plausible to mean something as small as unicellular) is just as absurd now as it was 3.5 billion years ago, what makes abiogenesis more scientific (observable and experimentable) than spontaneous generation? Cycloneman, you say "abiogenesis in modern theory is the creation of autocatalyzing primitive RNA molecules from surrounding chemicals."
So assuming physical conditions (your "autocatalyzing" & "surrounding chemicals") at some point 3.5 billion years ago were perfect, let us sort through what scientifically-deemed "living" RNA molecules have been modernly recorded to form: RNA viruses, and the next-smallest recorded organism, the Nanoarchaeum, which is symbiotic. Logically, both must be thrown out in our consideration of the origin of life, since in the start there was no host cell to use as a resource for the RNA viruses, and no other organism to be symbiotic with for the Nanoarchaeum (this goes for any symbiotic or parasitic microorganism).
Nanobacterium are claimed to be "living," but the National Academy of Sciences says,
So even if we allow Nanoarchaeum, we're talking about perfect conditions setting up chemicals to make a set of 490,885 nucleotides in a specific order, and then a second time, since it is symbiotic. What are the statistics for that?
Yet we can get smaller and smaller if we do not strictly define "life", and I cannot say it better than Dov Henis titles his article on this subject, Life is Wholistic Until Decomplexed to Energy.
My point becomes this, something unobservable and that lacks experimental ability is not science as popularly defined (systematic knowledge of the physical or material world gained through observation and experimentation). Abiogenesis presently falls under this unscientific category in my opinion. So does any early-history-of-life theory, unless something observable is presented, such as fossils or present-day experiments in which, from inorganic matter, a reproducing, adapting, metabolizing, growing, homeostatic, organized, and stimuli-responding life-form is created.