When that happens, the decade that follows will put the 100,000 years before it to shame. 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.This paragraph negates the author's thesis. If God exists, he predates all creation. Thus, He could not "evolve" since He is already by definition, perfect and unchanging.
Thus, we have identified a criterion for distinguishing between God and "god-like" ETs.