Is that actually true?
The "God does not play dice" comment re. quantum mechanics was not an admission that he believed there was a deity involved - he was just being poetic* and it was taken out of context.

*_{And there, of course, is the problem, because no one expects physicists/mathematicians/patent office clerks to be poetic...}
(The Supreme Crow lives under the stairway and sleeps in your hat, Thu 1 May 2008, 11:24, archived)

I believe it was just near the end of his lifetime when Quantum theory started developing when he started working on his own unifying equation which factors in space for a god.
He obviously didn't literally write god into his equations, because that would be mathematically bizaare. I think this was just a short time before he died, so he obviously didn't finish it.
(Jeru The Cunt of Monte Cristo, Thu 1 May 2008, 11:31, archived)