There can be no doubt that Einstein believed in a creator. The deniers will start off by claiming Einstein didn't believe in God and then quickly backtrack when the multitude of his quotes to the contrary are revealed.
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:
"The fanatical atheists," he wrote in a letter, "are like slaves who are still feeling the weight of their chains which they have thrown off after hard struggle. They are creatures who--in their grudge against traditional religion as the 'opium of the masses'-- cannot hear the music of the spheres."