Looking over the "recipe" again, I notice one thing I failed to notice earlier; at no point have you formally defined the uncaused cause as God. That's a weak step, but if you actually want to use that argument to argue for monotheism (instead of merely the presence of an uncaused entity, nature unknown) then I think it's a necessary step. Some of the assumptions necessary to eliminate multiple uncaused causes are a bit weak, but I think that you have a very good argument that somewhere in the history of the universe there must be at least one uncaused cause of some sort.