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Einstein was never an atheist, he wavered a bit during his life between agnosticism and later he returned (at least on a practical level) to his birth religion of Judaism in involvement with the state of Israel.
Einstein always protested against being regarded as an atheist, he complained about what he called "Bigoted" atheists, and went further saying, "...then there are the fanatical atheists whose intolerance is of the same kind as the intolerance of the religious fanatics, and comes from the same source."
Btw, on the subject of scientists & religion; the pioneers of quantum mechanics, Heisenberg, Schrödinger & Planck all rejected atheism.