No you can't go ad infinitum, it only ends up ad infinitum if you're looking for more and more different physical things, eventually you'll have to come to the conclusion that the SYSTEM, whatever you consider as responsible for this moment, the next moment, the appearance of change between these moments, the movements, the progress, that this results in this, etc, that will lead you to whatever is actually "The Ultimate Power", which is not going to be some creature or physical thing or even a "set of laws that "just are"" but instead to a Chaos which has the Ability to Generate "a system of laws" and all this resulting stuff. There is no God except what is Actually Ultimately Responsible for Generating Your Experience, The System, that it moves, that it moves the way it moves and does what it does. It isn't a creature, it isn't a person, it isn't like your brain even or thoughts.