I missed your point again. No two people have the exact same concept of what a god is. "God" (again capital g)is a proper name for Yaweh/ Jehova/ I AM. This God of Moses has a pretty big biography that describes Him in detail. Einstein has made it crystal clear that he did not believe in that god. It can be said that he believed in a god if you define his god as "universe". That is how he used the word and that's how he explained it himself. To a Catholic, Mary is not a god. To a Hindu, the way that Catholics view Mary would be as a god. (Eternal, Human body in heaven, performs miracles, intercedes on behalf of petitioners, is wife of chief god, makes lovely statues). If you insist in saying someone believes in god, it behoves you to define which god for the statement to have any meaning. My definition of sin is Bill Belicheck getting named coach of the year.
It does? Well, why isn't the reverse true? You said Einstein didn't believe in God, and you were talking about one partuicular being worshipped by just two of the world's many religions, but you didn't specify that.