The idea is that the Singularity would be a point in time where the totality of human expert knowledge would be insufficient to comprehend what an AI (or an AI-designed AI) would be capable of comprehending.<p>If we think human-level AI is possible, then superhuman AI would also be possible. Note, though, that while not infinite, human cognition is complete, that is, a human or group of humans is only limited by time or resources. No matter how much time we have; a dog will never stumble upon quantum mechanics. But given enough time, a human being can construct an expert knowledge repository, even though he himself is unable to understand some of the intermediary steps or details.<p>Now, this is where Singularity takes a turn to religion. Some people believe "it" to a future AI with enough physical means to be indistinguishable from a god. Not just a god, but one single God.