If there was any extraterrestrial civilization more advanced than ours, yet even remotely similar to ours, and quick space travel was possible, it would have already found us. Having found us, it would either contact us (hasnt happened, that we know of), or it was deliberately avoiding it. In this last case I doubt it would allow itself to be found by humans in the next few centuries.
Personally Im very sceptical about the existence of any more advanced extraterrestrial life forms. The only argument for such thing is the near-infinity of the universe, which should lead to live appearing and evolving in many places throughout the universe, leading to the development of civilizations of intelligent creatures. Sorry but thats no proof.
Still, lets admit the argument is right. More advanced is hard to define, Ill be content to admit it means this extraterrestrials possess the technology for practical, fast space travel. Any more advanced extraterrestrials would travel to other planets. If the near-infinity argument was correct several (many, indeed) extraterrestrial civilizations should already have risen, travelled the universe, and met each other. They would not eventually meet only if practical space travel is impossible. What is the likeliness that all of these would fail to notice, have no interest on, or deliberately avoid our planet? If they existed and could travel we should already have been visited by extraterrestrials. There is no serious evidence of such a thing.
Notice that the existence of other civilizations that do not possess the means for practical space travel (which we also do not possess, nor know if we ever will) is pretty much irrelevant, as contact will probably be impossible. And if they couldnt figure out how to travel its probably impossible (remember, were admitting the theory near-infinity
But what if mankind in the future ever encounters something akin to the planet imagined by Stanisław Lem in Solaris? That seems more likely.
On a side note, as a european I never cease to be amazed at how americans are obsessed with religion
Where I live anyone but a priest who bothered to memorize any substantial part of the bible would be considered a nutcase by most people (or a jehovas witness, which would amount to the same).