We all agree on the facts.
Fact one, noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) is a logical necessary prerequisite to phenomenon.
Fact two, noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) is undetectable directly and phenomenon is an untrustworthy source of knowledge regarding the true nature and or fundamental characteristics of noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source).
The majority of quibbling seems to be about the ontological framework that each individual decides for themselves is subjectively "best".
Yes, noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) "exists", but only as a logically necessary prerequisite to phenomenon.
The secondary problem appears to be the astronomical leap that some people seem to be unable to construct a rational bridge between this logical necessity and a specific religious belief.
There is no straight line between noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) and "Orthodox Christianity" or any other specific belief system. Noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) simultaneously justifies and debunks all religions equally.
Noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) = deism. And that's it. No inductively implied laws or rules or books or anything else.
If you deny that "knowledge" is necessary, then all bets are off because laws and rules and books and teachings and traditions axiomatically qualify as "knowledge".
I also have no problem stating that noumenon (a.k.a. Ultimate Reality/The Truth/[G]god/The Source) is a logical and necessary prerequisite to human consciousness.
But that still doesn't give us any hope of any sort of practical knowledge.
In fact, it (NURTTGgTS) is knowledge-proof (anti-knowledge/unknown and or unknowable).