While man's proof of God's existence made it impossible for sentient beings not to believe in God, his subsequent non-existence in a puff of logic at least made it possible for them not to be religious.
This chain of logic took some time for many to follow. After all, they reasoned, if God had existed, he must have designed the universe, and therefore the universe must be the playground of his chosen people. Of course, the non-existence of God occurred at the exact same instant that his existence was proved, so his disappearance happened before anyone could ask him any questions about whose God, exactly, he had been.
This led to a great many wars in the name of a God whose identity remained a mystery.
Some argued that if God had been the jealous and vengeful deity of those who called themselves the chosen people, why would he have populated the universe with more alien species and in greater numbers than occupy a single paltry planet in one of the less hospitable corners of the galaxy?
Meanwhile the scientists argued that any universe could be explained as the work of some sort of God - even a universe of negative probabilities or other logical absurdities could have been designed by an idiot. Many scientists argued that this was, in fact, the case.
This caused those who believed themselves to be the chosen to declare war on the scientists, who responded by pointing out that if an infinite number of universes existed, then there must have been an infinite number of Gods, and that there was no point in arguing about a deity who no longer existed anyway.
This saved the scientists and averted universal catastrophe, causing the great philosophers and thinkers to pose a different question - not about who designed the universe, or even why, but rather about which universe they actually inhabited.
This quandary was further complicated by the fact that man, along with many other races whose level of technology had advanced beyond the digital watch, had decided that true understanding of the universe could only achieved by copying it. With no evidence of a patent for the fundamental laws of the original universe, anyone could recreate it, and they often did.
Once the technology was available and designer universes had become more and more fashionable, the issue of intellectual property rights reared its head. Because anyone could design a universe, they started to introduce copyright protection. In some cases this involved the fine-tuning of background radiation to signal ownership by a particular memetect or memecorp. In other cases they tinkered with the building block of life, DNA, creating a genetic barcode that clearly identifies the designer or, if a universe was commercially commissioned, the copyright notice.
This turned out to be rather easy, resulting in some very unusual universes created for some very selfish reasons. For example one universe was created just so its designer would be the most important person in it, while another was very obviously created to allow a particularly bloodthirsty race of mutant cyborgs to conquer it, exterminating every other sentient species until they got bored and tried it on with the universe next door. Yet a third universe, reputedly created by one Arthur Dent, was designed by a computer to create the conditions necessary to produce the perfect cup of tea.
Of course OSUM, the Open Source Universe Movement, argued that as the laws of one universe cannot apply to that of another universe, that there is no such thing as piracy, and that copying a universe was therefore entirely legal.
This led MEMU, the trade association for the Memetects and Engineers of Multiple Universes, to get clever, fine tuning the background radiation of each new universe to its unique barcode, thus creating tamperproof universes, copy-protected so that anyone attempting to tinker with the laws of nature would be evicted from their current position in the space-time continuum, cast adrift beyond the reach of patent lawyers.
Then OSUM retaliated by throwing time travel into the equation, going back and fine-tuning the laws of the original universe so that God could exist as a result of faith. This meant that it was man who created god in his image, and not the other way around, which created a complex but sizeable legal loophole.
