Being able to imagine something doesn’t make it plausible.
You cannot disprove the existence of God. Now, amazingly there are a lot of people who think that’s a powerful argument. It somehow seems to suggest to them that therefore the existence of God must be about equally likely as non-existence. The point about mock religions such as the Invisible Pink Unicorn, the Flying Spaghetti Monster and the Celestial Teapot is simply to demonstrate that it’s not the case that because you cannot disprove something therefore that makes it the slightest bit likely.
“What if you’re wrong?”
Well, what if I’m wrong? Anybody could be wrong. We could all be wrong about the flying spaghetti monster and the pink unicorn and the flying teapot. You happen to have been brought up, I would presume, in the Christian faith. You know what it’s like not to believe in a particular faith because you’re not a Muslim. You’re not a Hindu. Why aren’t you a Hindu? Because you happen to have been brought up in America, not in India. If you’d been brought up in India, you’d be a Hindu. If you’d been brought up in Denmark at the time of the Vikings you’d be believing in Wotan and Thor. If you were brought up in classical Greece you’d be believing in Zeus. If you were brought up in central Africa you’d be believing in the great joojoo of the mountain. There’s no particular reason to pick on the Judeo-Christian God in which by the sheerest accident you happen to have been brought up and ask me the question, what if I’m wrong?
What if you’re wrong about the great joojoo at the bottom of the sea?
-Richard Dawkins, paraphrased from Dawkins in Lynchburg VA (part 2) The God Delusion