I am not quite sure of the exact specificity of your question.
Do [Buddhists] hold there is “being” (onto-theological being?) above our sensory capacity?
Absolutely.
Buddhism, is really neither atheistic nor “theistic” (as we understand the term).
Our understanding of “theism” is influenced by Zoroastrian-influenced Judaism, and a certain “fideism” attached to the concept; and the world-views are subtle and difficult to compare in linearity…
The metaphysical ideology and attitude of Buddhism is paradoxical, yet not irreverent.
Buddhism nowhere DENIES the existence of a supreme personality of God; the DENIAL is only of subordinate, cartoon-like versions thereof; yet to the theistic inquirer, simply questions the inquirer of speculative theoretical dogma of the supreme personality of the Godhead,
“You are ready to comprehend the supreme Godhead, when you cannot even stop sacrificing animals to lower terrestrial demonic idols in unrighteousness, serving in baseness your animal faculties and organs of corporeality as little godlets, participating in ignoble fornication so bestial, etc., for even ONE day? Yet you really are ready for knowledge of the ineffable Divinity? Really?..”
So, in truth, if you really dig (as I have), there is a very rarefied, esoteric kind of transcendental, idealist supernatural monotheism concealed within Buddhism; yet the metaphysical method is purely APOPHATIC…
But the “negative way” is not condemned in our own Faith, if understood rightly. Just to randomly cite one early Church theological master, here is Clement:
newadvent.org/fathers/02105.htm
“This discourse respecting God is most difficult to handle. For since the first principle of everything is difficult to find out, the absolutely first and oldest principle, which is the cause of all other things being and having been, is difficult to exhibit. For how can that be expressed which is neither genus, nor difference, nor species, nor individual, nor number; nay more, is neither an event, nor that to which an event happens? No one can rightly express Him wholly. For on account of His greatness He is ranked as the All, and is the Father of the universe. Nor are any parts to be predicated of Him. For the One is indivisible; wherefore also it is infinite, not considered with reference to inscrutability, but with reference to its being without dimensions, and not having a limit. And therefore it is without form and name. And if we name it, we do not do so properly, terming it either the One, or the Good, or Mind, or Absolute Being, or Father, or God, or Creator, or Lord. We speak not as supplying His name; but for want, we use good names, in order that the mind may have these as points of support, so as not to err in other respects. For each one by itself does not express God; but all together are indicative of the power of the Omnipotent. For predicates are expressed either from what belongs to things themselves, or from their mutual relation. But none of these are admissible in reference to God. Nor any more is He apprehended by the science of demonstration. For it depends on primary and better known principles. But there is nothing antecedent to the Unbegotten.”
Now is Clement an agnostic atheist or pantheist?
And Christian scholars, inept of the (legitimate) tradition of apophatic “negative theology” within their own religion, took a few translated verses, stripped of relational context, and proclaimed, “Agnosticism, atheism, pantheism!” No such simplicity…
Absurd? Learn Pali, and read. There is no other way. Translations in English are currently weak, even today. Seriously. The only way I learned is by learning Pali and Sanskrit, and studying the earliest of their texts…
There are differences in ontological and metaphysical belief, surely. But the simplified popular misunderstandings just cloud our minds here…
If you are serious: Do not study anything but the original canon in Pali, or Sanskrit. Modern interpreters have distorted everything.