The idea's that God (the universe) is the ultimate totality of everything, by definition.
Einstein was a proponent of hidden-variable theory. The gist is that, if something appears random, then it's really just chaotically dependent upon information we don't have.
So, God (the universe) doesn't play dice. Subsets of it might, but Einstein was basically just pointing outheld that anya complete description of the universe that includes randomness would be an incompletefully deterministic. Any description reliant on randomness merely omits the hidden variables.