I doubt most believe in alien life. They're young earth believing fundamentalists. It doesn't help that they use a perverted Bible and that the watchtower magazine they get every week is considered gospel on par or higher than the Bible. But to your question: if alien life was discovered, they would initially consider them to be wicked and pagan, and would double their efforts to them to bring the word to them by any means. The ones I'd be really interested in are Mormons, given they believe God lived in another planet and that if your an good goyim Mormon in this life, you'll get your own planet to play god on.