If there is no multiverse, "Why is the universe the way it is rather than any other way?" is a perfectly good question to which we haven't found the answer yet. However, theists don't merely ask that question, they use our ignorance as an argument for the existence of a deity. They think a creator is the best explanation for fine-tuning. The obvious counter-argument is that not only is a creator not the best explanation, it's not an explanation at all. We can ask the exact same question about the creator that we asked about the universe: Why is the creator what it is rather than something else? Why isn't 'He' something that couldn't be called a 'creator' at all, like a quark, or a squirrel? Or, to put the whole thing in the right perspective, why is the greater universe formed by the combination of our universe and its creator the way it is, rather than any other way?

At this point the theist usually says that God is necessary, or outside of time, which could just as easily be true of the universe as we know it. Or the theist might say that God is eternal, while our universe probably isn't, which is irrelevant. None of these alleged characteristics of God's explain why He's fine-tuned, anyway.