He has a point, the chance could well be >0.00000001% but it exists nonetheless However, I would counter that the probability of a deity being formed from nothing, immediately possessing the thought and will and capability and imagination and the power to create the entirety of the universe from nothing, while simultaneously devising every law of nature and physics known to man (along with many more that aren't) is even lower than that of the Big Bang. After all, if you put a bunch of watch parts into an empty box, seal it off, and then shake it about, the chances are looking pretty slim that a deity would materialise inside the box with the knowledge and means to assemble the watch together perfectly