No, there can only be two reasons there are no divine revelations: God is either laissez faire (hands off, in order to protect our free will), or God doesn't exist.
Go read Lao Tzu's
Tao Te Ching. The Tao is the most
laissez faire divine entity out there, to the point where anarchists will often quote Taoism in explanation of their stateless beliefs.
Then How did he come up with "heaven's will", or what rituals, sacrifices and worshiping spirits in nature to do and why. He either invented all that or claimed revelation.
Read Confucius'
Analects. He gets his knowledge from his observations, the ways of his ancestors, and ancient books, especially the
Book of Odes. It might be that these ancients and their books were derived from revelation, but we have no evidence for that. (Well, no evidence for that outside of Baha'i scriptures, which are not relevant unless you are of that Faith.) So it is considered "unrevealed" due to lack of historical record of a "revelation" in Confucian belief.
Even knowing the deity exists is a revelation in itself, and again,
It is not, by the definition and understanding of "revealed' in context of "revealed religion" and "unrevealed religion." With these terms "revealed" necessitates a prophet who is handed his scriptures from a deity.
Think (strange example but bear with it) of the Lovecraftian mythos as an example. It's fiction, but the "gods" in that mythos (with one exception) do not even comprehend humans, the humans being so far beneath them as to be insignificant. The protagonists still discover and experience the effects of these gods, but their beliefs are not predicated on any "revelation" given or revealed by these cosmic horrors, who don't even notice mankind much less care to reveal the secrets of the universe to them. By the definition of "revealed religion", the deity must do the "revealing" intentionally. Since there's no historical evidence that Confucius was acting on revelation of Heaven, nor that Lao Tzu was acting on revelation of the Tao, we say they are "unrevealed."
that would spoil the test, a test that is both for God's and our benefit.
Which is why I believe, if God exists, that God created the universe so that we could have no evidence of It's existence. How do we worship such a God? By the pursuit of Truth, being knowledge, justice, love and beauty. All that exists is Truth, only sentients can fabricate or harbor a lie.
All good, but not relevant to the definition of "revealed religion" and "unrevealed religion" as commonly understood.