Well, since someone else has already dredged the thread up from the past...
Hmm... the "
deity of existence"...
In the context of
eternalism, things can actually exist (they durably "are").
Whereas in contrast the
presentism or commonsense interpretation of "time" replaces existence with ephemeral "happenings". As a consequence, that sequence of short-lived events replacing each other requires regulation by principles/laws (metaphysical or conceptual entities). Not unlike a dream having to be governed by a brain (though in a much more sloppier and inconsistent fashion).
In the past, managing principles or abstracted regularities of the world got popularly personified into gods, because humans have a traditional penchant for anthropomorphizing regulating concepts, so they can pray to them for intervention.
Thus, "deity" suggests an overseer that manages in the context of presentism (reality as a process). Rather than simply a universal materialization that subsumes all things and incremental differences, and grants them actual, "shown" or phenomenal existence (which includes the tiny, subjective local sensory appearances correlated to brains of organisms on a planet).
Ironically, all humans (which surpass vegetative status, anyway) seem to at least be implicit or subliminal panpsychists. IOW, our default adherence to a generic panpsychism is substantiated by our behavior and failures, not by verbal reporting and personal acknowledgment of such a belief. Due to humans having never actually produced either a useful instance or model of the universe that was truly devoid of phenomenal and intellectual properties (this includes clarification of what the word "failures" referenced).
Primary/secondary quality distinction
https://en.wikipedia.org/wiki/Primary/secondary_quality_distinction
Although "primary qualities" are deemed to be properties of non-represented existence ("thing in itself" territory), they are actually technical or physical descriptions derived from measurement, relationship, and outer perceptual/sensory appearance. Aside from the obviousness of that artificial origin and dependency upon intellectual activity, abstract description just like everything else must manifest or be materialized to be useful (existence as "not even nothingness" is an otiose hypothesis).
So... in conclusion, the totality of existence as some (knowable or unknowable) objective manifestation might fly as "all is one" in eternalism (i.e., it has no need to be a god-like manager -- just validly existing suffices). But in presentism, "all is one" as some deity or assembly of principles that is managing a process of ephemeral changes is more in the unnecessary metaphysical additions territory (presentism does need such baggage, but the rival view does not).