As hard as you keep trying it just isn't working. Dawkins makes a reasonable assumption because there's no reason to assume otherwise. You also assume your mathematical proof is rock solid even though it assumes infinite time and a finite universe both of which may not be correct. Just the idea that infinites can or must exist at all has been widely debated for centuries. Trying to make an absolute statement of fact that "Nature doesn't make things in ones." is quite specious. So if you want to talk about making assumptions, you might want to revisit some of your own.