"I would like to immodestly propose Shermer’s Last Law ... 'Any sufficiently advanced ETI is indistinguishable from God.'
"God is typically described by Western religions as omniscient and omnipotent. Because we are far from possessing these traits, how can we possibly distinguish a God who has them absolutely from an ETI who merely has them copiously relative to us? We can’t. But if God were only relatively more knowing and powerful than we are, then by definition the deity would be an ETI!
"Consider that biological evolution operates at a snail’s pace compared with technological evolution ... Then, too, the cosmos is very big and very empty. ... Ergo, the probability that an ETI only slightly more advanced than we are will make contact is virtually nil. If we ever do find an ETI, it will be as though a million-year-old Homo erectus were dropped into the 21st century, given a computer and cell phone and instructed to communicate with us. The ETI would be to us as we would be to this early hominid — godlike.
"Because of science and technology, our world has changed more in the past century than in the previous 100 centuries. ... Extrapolate out about a million years (just a blink on an evolutionary timescale and therefore a realistic estimate of how far advanced ETIs will be), and we get a gut-wrenching, mind-warping feel for how godlike these creatures would seem."
Shermer, Michael. "Shermer's Last Law". Michael Shermer. Jan. 2002. Web. 22 Mar. 2016.