I'm just saying that, of necessity, if you have already discarded a supernatural intervention for life, then you must advocate for abiogeneis. Unless you propose "sporing", which would involve aliens and such. Ultimately it boils down to if you believe life can form on its own, or it can't.
In quest for a proper answer in nature, beliefs or strong beliefs, are null and not needed in science. what matters is evidence and what it most probbably imply. Infact, new fields of study in science such as Abiogenesis, string theory, ect... thier findings are probitionary in nature & are finely educated guesses until more observation, validation & test gives it more credit (or discredit). Science has the habbit of increasing the precision of its theories in time. there is no area for beliefs, faith & ultimate truths.