There is no such thing as supernatural or miracle, just something that is still beyond logic of the observer.

There is no such thing as magic, supernatural, miracle;
only something that's still beyond logic of the observer.

Smartass Disciple: If you are really a master, then make me see miracles!
Master of Stupidity: Go to sleep and dream, then wake up thirty years later!

There are people who believe in the existence of angels, but do not believe in alien existence. There are people who believe that aliens and angels are the same creatures. But there are people who are much worse, those who have seen and met angels, and witnessed the presence of aliens, but does not admit even the slightest about the linkage between both. And the worst thing is, they even try to maintain the status quo.

You do not say 'It's classified' to a certain thing needs to be hidden, because people are going to find it in anyway possible. Say it in a way with your language that gives people a benefit of the doubt.

The common reason why human mind is so difficult to accept and believe in the alien existence, actually has something to do with the possibility of the existence of some unknown creatures, which may far more advanced than human in terms of knowledge and know-how, yet at the same time people assume that human is in the top level of food chain pyramid on this planet earth.