Decades before atheist scientist and author Richard Dawkins called God a "delusion," one world-renowned physicist - Albert Einstein - was weighing in on faith matters with his own strong words.

“The word God is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honorable, but still primitive legends,” Einstein wrote in German in a 1954 letter that will be auctioned on eBay later this month. "No interpretation no matter how subtle can (for me) change this.”

Dubbed Einstein’s “God Letter” by the Los Angeles-based auction agency that's posting it online,  the original document will be up for grabs starting Monday. The opening bid: $3 million.

The letter provides a window into the famed genius's religious beliefs. Einstein wrote it to Jewish philosopher Eric Gutkind, one year before Einstein died, in reaction to Gutkind’s book, “Choose Life: The Biblical Call to Revolt.”

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