Meh... I would bet most Christians ascribe to the same sort of philosophy that my pastor did back when I was in high school. He always said, "I don't know if there are aliens out there, but if there are they need Jesus too."

It's a bit silly, but he was also a creationist. If he could be fine with aliens but not evolution, I imagine the same is true for most other religious people.

I don't understand why people think religious people will go bananas if aliens are confirmed. There will be unrest at the beginning, sure, and probably more than one dangerous alien based cult will rise. But most of the religious leaders will just adjust their narratives and try to retain as many followers as possible. And most followers will be eager to take explanations and not challenge their core beliefs. If I remember correctly, the Catholic church said they are not opposed to the idea of intelligent life and civilizations outside earth, so it seems like they are somehow prepared.

I think most religious leaders are smart enough not to rush to the "aliens are demons" conclusion, specially if they are proven not to be hostile (I assume they are not if the government are dealing with them).

Hmmm, I'd argue the idea of God is anything but 'terrestrial', maybe even bordering on 'extra-terrestrial'?

Why stop at religious people? Most people probably wouldn't be able to go back to their lives after discovering there's a whole new dimension of things out there and there's a possibility to travel and see very weird things.

So far we've sort of come to terms that we're alone in the universe and the great void is unexplorable. But what if it isn't? Wouldn't everyone just want to go out and do some Firefly-grade shit? How would one just go back to performing risk assessments for insurance companies after learning that?

Are you aware that the overwhelming majority of Christians are taught to not take the Bible literally? Seriously from day one the Roman Catholic Church has held that position because that's the exact same position the majority of rabbis at the time held about the Hebrew texts. Christianity could easily account for other life but most of Islam takes the Quran literally as Muhammed is supposed to have "fixed the mistakes" of the older texts. Simply put The Vatican wouldn't need to do much to account for aliens.