Recently, over at townhall.com, columnist Dennis Prager wrote a piece on "Why Some Scientists Embrace the 'Multiverse'". The article is a good read; in the first part, Prager describes the incredible scientific evidence for the design of the universe for the benefit of life. The bio-friendliness of the universe is undeniable, and is admitted by scientists of all stripes. But the "design" of the universe then begs the question: who designed it? Or, how did it come to be this way?
However, Prager then transitions into a discussion of the multiverse (the idea that there are many, perhaps infinite, universes out there). If true, the multiverse could get around the problem of the fine-tuning. After all, if there are an infinite number of universes out there, all with random laws of physics, there would just have to be one in which the laws were "just right" for life to exist. No matter how improbable it would be for you to hit that bullseye perfectly, given an infinite number of tries, it's bound to happen. And that's the universe we live in.
But Prager implies the multiverse is solely proposed by scientists in order to get around the fine-tuning. This is incorrect. The multiverse hypothesis is a direct inference from the laws of physics. If we've got the equations of our own universe right, there is a very good chance there are other universes out there. Just because it's impossible to detect them doesn't mean they aren't there. And that certainly doesn't mean the multiverse hypothesis is some concoction by atheists to get around the fine-tuning.
So if the multiverse exists, and I don't think we can discount it, where does that leave the fine-tuning argument? It does seem to provide a nice refutation of fine-tuning pointing to God as designer. Perhaps that's why it's so popular, and why it gets so much attention. (And perhaps that's Prager's actual point: that the multiverse is popular with scientists, even though there is no direct evidence for it, because it seems to satisfy their worldview.) But the reality is, the multiverse only makes the design argument for God stronger.