I've long held that the fact mankind hasn't eradicated himself from the planet, either by ignorance or arrogance, is one of the finest proofs that there is a God who has a plan for us.
As far as aliens, I think the Bible really indicates man's uniqueness in all Creation. Not an absolute definitive answer is given, but the overall vibe is we are it, other than spiritual beings (angels and demons). It's interesting that many UFO/alien encounters and observations see things that break the laws of physics. Could be they are beings that aren't limited by those laws? Just a theory of mine.
I'm abandoning the DUmmie bashing for just long enough to weight on on this topic, it's an interest of mine.
In my guess-timation that is based on wild and unproven ideas about pretty much everything, I think that other life does exist, but it is not nearly as common as we would like to believe. I also don't think we will ever encounter them, IF space and time behave like we currently think it does. The universe IS a grand design in my opinion. God created the perfect system that is just simple enough to endure, but just complex enough to do what is required. The distances are vast, almost beyond the capabilities of our imaginations, and I don't think we'll ever conquer that. It is by design... wild theories regarding parallel dimensions aside... which is, by the way, a somewhat interesting theory among many in that field, not just sci-fi movies. We are finding exoplanets by the thousands now, and coming up short finding any that fall into our idea of a reasonable life sustaining system. Of course, our methods are still crude and observations are based on a huge helping of assumptions since we can't really measure much from these distances.
I study this stuff as a lame hobby, not in great detail, but just enough to understand the current theories and whatnot. And from everything I've seen, the science behind all of it makes me an even stronger believer in God. I mean, some people have gone so far to disprove Gods existence that they believe in a "big bang" that created everything from nothing. Sounds exactly like God's work to me.
And regarding the other topic of aliens visiting us... I have my doubts that they can even get here, but if they've figured that out, they are probably smart enough to calculate that the risk of interfacing with unknown species is a risk that brings little or no reward for beings that would already be that advanced. Why would they take such a risk? If they needed something that is here, something they couldn't acquire elsewhere (not probable), they would just level this place and take it.
Anyway, that's how I would view the entire thing from the outside looking in.