Let's just say that what Einstein called God (the God of Spinoza) was not really what anyone trying to justify their own religious beliefs would want to use to support an argument from authority.
Spinoza's central claims were that 1) there was no immortal Soul or afterlife 2) God is abstract, impersonal, and unknowable 3) God is Nature (capital N). This is the exact opposite of the personal god of any current modern Abrahamic religion would like people to believe.
What Einstein was effectively saying when he believed God wasn't playing dice with the universe was that he didn't buy into weak or modified anthropic principle to explain random vacuum fluctations eventually leading to -> big bang leading to-> our observed universe with singing dancing meat. He thought it was more deliberate, but that isn't remotely the same thing as intelligent design either. He (nor Spinoza) didn't necessarily believe that humans were special or the "goal" of Nature. Spinoza didn't even believe in free will although he believed that men _believed_ they had free will and that the distinction is important.
That was how humble they were, as far as that went. They were too humble to think we are special, nor can we make strong assertions about things that they felt are unknowable.
Spinoza and Einstein chose to call this idea God out of lack of a better term to describe the ultimate insignificance of us to it (Nature).