Former U.S. Astronaut Edgar Mitchell and many others are asking for President Obama to open the notorious UFO Files of the United States. Mitchell claims that he, personally, knows of UFOs, and wants the matter finally day-lighted.
These, although not Project Blue Book, (since I believe those may have already been declassified to some extent), apparently, according to Mitchell and others, contain information that confirms that there are aliens.

Just supposing this was true, and a U.S. Astronaut did know, for a fact, that these *beings* exist, what, if anything, does this mean to theists adhering to particular literalist faiths and their belief systems, and to non-theists and their position of non-belief?
What could or would change if there is finally proof of other-worldly life?
How would theists react? What and how would theists explain such an existence, if it was shown to exist?
Depends on the theists. Let's say extraterrestrials decided to pay us a visit. First of all, they would somehow have to land without getting shot down by (insert usual suspects here). Then, assuming their safe landing, it is probably pretty safe to assume that they don't look like us at all. That would be enough for some people.
The predictable jeezoid christian explanation would be "demons!", "end of the world!", and all that apocalyptic crap. I think the muslims would also lose it as well (and blame it all on the kaffir - "if those stinking Americans hadn't gone to the moon and Mars, this wouldn't have happened, blah, blah").
As far as shattering faith, I somehow think that would be a function of each individual's relationship to his or her religion. Things like native intelligence, level of devotion, knowledge of scriptures, etc would all be involved.
It is entirely possible that some would worship these aliens as gods in their own right.
But I think we'd still start a war with them.
For myself, since I already believe that the Universe harbours life on other planets, (
and that the odds favour it) it would be just confirmation of personal belief.
You might also want to look at this.That's my take.