Wrong.
You can know that the origin of everything exists without knowing what it is.
We know there is an explaination for why some stars are occluded. We know that there is a reason for rotational speeds of Galaxies not matching their visible mass.
The answer is called dark matter. We simply don't know everything about it.
Dark matter is another example of people learning things backwards. They read about dark matter before learning about the reasons it is postulated.
People seem to fullfil this false need of needing to know what it is before they can believe it exists by "knowing God". But we can know that there was beginning without knowing what it is.
The proposition that there is an origin of everything that exists is itself a proposition. Whether it is true or not is yet to be established. Furthermore, assuming that the "everything" that you believe exists coincides with the "everything" that exists beyond your ability to know it, is a big assumption. You know what you know, and you should know what you don't know. Distinguishing observed knowledge from logical conclusions based on assumptions is important.
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We know that there is a reason for rotational speeds of Galaxies not matching their visible mass.
It would be more accurate to say, "we know that there is a reason for presumed rotational speeds of galaxies based on assumptions about observations and other assumptions about their mass."
The assumption that there is a factual physicality of what is on the other side of the light that travels from that physicality to the observer shouldn't be the basis for conclusions about the total nature of that physicality.
I believe that the "dark" stars are not dark, but rather their light is somehow diverted from its trajectory before reaching Earth. This must be some effect of gravity or space-time curvature.
Whatever it is, there's no way for us to know it without it existing as a presumed unknown first. In other words, it has to exist as knowledge-potential before it can be established as an actual reality.
Things that have yet to be discovered exist initially only as indications of the existence of something not yet known. The observed data exists, but an explanatory model has to be created for the observations before the existence of something new can be established. So, whatever it is physically exists, yes, but only as a potentiality from the perspective of a human observer. The claim that it exists beyond the limitations of human knowledge may be true, but that truth is not verifiable without supporting evidence. So the claim that something exists beyond human knowledge of it is false from an empirical standpoint, no?