Life exists. It is all around us. We are alive, or living beings, creatures, either intentionally (intelligently) made/designed or the product of time, a lot of time and chance, and unintentional in design and in purpose or function. But we're alive! Even the most ardent skeptic must accept this. So how does that help us, or answer the question, What is the origin of life?
Here is an argument which I believe demonstrates sufficiently, according to how we generally consider a matter to be good or as some consider it, "scientific" (that is, by having sufficiently demonstrable results according to a repeated and tested process), namely:
1) Life exists.
2) Based on all known, shared, and/or otherwise available scientific study and information life can only come from something or from someone already alive or living.
3) Therefore, since based on all known, shared, and/or otherwise available scientific study and information life can only come from something or from someone already alive or living, the origin of life must be life, or something or someone already alive.
4) Further, and based on the above (namely, that all known, shared, and/or otherwise available scientific study and information which shows without exception that life can only come from something or from someone already alive or living), life is eternal because life is, in fact, here.
I contend the above argument sufficiently responds to any argument which claims not to be able to account for the origin of life as life itself, or as something or someone already alive or living, and that life must also, therefore, be considered eternal.
Whether this demonstrably and logically eternal origin of life (namely, life itself) is personal, intelligent, or impersonal or unintelligent I will consider similarly, separately.