Yes, Catholic Christians deny hidden revelation. Now, that is not the same as the milkmaid theory, which is wrong. The revealed truth may be very hard to grasp, especially for a proverbial milkmaid, but there is no intention on the part of God to hide them. The perfect example of that, is, by the way, the revelation of nature. No one said milkmaids should take the commanding heights of science. But God gave us the universe the laws of which we can apprehend over time. It is not a closed book.
::Sigh:: I'm sorry you feel that way.
Do you believe the secrets of the Chariot (Ezekiel 1) are equally accessible?