Regarding Spinoza....there are a lot of questions about just how much Einstein studied Spinoza or that he even considered him carefully at all. Spinoza was most assuredly not an atheist, pantheist, or monist, or any of the usual things people make him out to be. It was, however, a fashion in those days to name-drop Spinoza.
When it came to atheists one thing is for sure, Einstein held them in contempt:
Nice quote.
Einstein didn’t believe in a Judeo Christian God that interacted with people and interfered with cause and effect. He left room open for Sinoza’s god who may have created everything and then just sat back and watched. He completely rejected heaven and hell and any life after death.