Hawking has come out definitively on the matter (“I’m an atheist,” he said in 2014), but Sagan and Tyson famously veer agnostic. (“Why not simply wait until there is compelling evidence?” Sagan once asked, and Tyson has said that “the existence of God is a scientific hypothesis like any other.”) What about Albert Einstein? Despite his most famous quote about religion, his views on God were — unsurprisingly — incredibly complex.
If the letter he wrote at the end of his life to an author of a book on Judaism was any indication, that attitude never did leave him. “The word God is for me nothing more than the expression and product of human weakness, the Bible a collection of honorable, but still purely primitive, legends which are nevertheless pretty childish. No interpretation, no matter how subtle, can change this for me,” he wrote in January of 1954, just a year before his death.
When Einstein said things like “When I assess a theory, I ask myself, if I was God, would I have arranged the universe in this way?” he wasn’t actually suggesting that the universe was built by an omnipotent being; he was instead trying to integrate scientific theories into his understanding of how the universe works already. You could call him a deist, or maybe an agnostic like Sagan. But he was neither a true believer nor an avowed atheist.