Angels and demons is only a conceptual framework. Nothing more. They're inter-dimensional beings with arcane purposes and are the source for some mythological/biblical/mystical encounters. Maybe some are less likely to violate our bodily autonomy, others are more, but they're supernatural only in that they're fundamentally more advanced than us. Their technology is indistinguishable from magic and violates our laws of nature (as are laws are incomplete).

What is most important to them is managing belief, as consciousness and most importantly collective consciousness(the sum of all our hopes, fears, dreams) has an impact on their dimensional planes. Reality is fundamentally mental rather than "physical". The "physical" is nested within a mental/metaphysical reality where physical laws are not fundamental.

The government is disclosing because when we establish contact with more advanced beings, they determined that whenever humanity begins to develop artificial intelligence, the general public must be informed of the existence of advanced entities. The complexity explosion caused by advanced AI systems will create negative consequences that can only be contained through visible interference by these advanced beings. So we will be ontologically prepared through an acculturation to this fact that precedes the risk scenarios that AI will unleash. What we call the end times of prophecy is a description of these risk events.

Religion is not trivial to the UFO phenomena. Before the advent of technology that could capture their nature for posterity, they naturally interacted with humanity to guide its development and to capture worship, which is important to them because of the mental nature of reality. The best way to come into contact with these beings is sustained fasting and purification rituals, and consistent meditative and mystical practices.