The reliable predictability of material behaviour at the atomic level is apparently dependent on the probability of certain quantum events taking place at a specific place and time.  This led to Enstein's famous quote -  "God does not play dice".  I would suggest that the cause of these quantum events is not random, but defined by an undetectable source which is specifically induced to give reality the nature we perceive.  In other words, most quantum events are controlled by God's will.  And He may have delegated other quantum events to be controlled by other sources of free will.