Mr. Tweedy, the problem with a real-world experiment for these conditions is that well, we don't have a test tube the size of the world's oceans, lighting bolts and acid rain, and several eons to let it fester. We don't know rightnow how life came to be, but that does not mean that a perfectly naturalistic explanation will not be found.
And what if the creator happened to be an alien that stopped by to shave and cut himself? A few drops in the ocean, and well, panspermia. There are, in all likelihood, a very large number of earth-like planets that could prove the starting ground for life in the universe, surely you don't dispute that given a few million years and even a one in a billion chance, well, life is going to happen.
And your argument breaks down once we abstract it one more level. Where did the creator come from? Do we have a Russian Doll of creators?