That depends on your definition of the word “god”. Einstein certainly wasn’t an Abrahamist, he was a pantheist. He believed the entire universe was comprised by a divine whole.

More of a pantheist

Edit:

https://en.wikipedia.org/wiki/Albert_Einstein#Religious_and_philosophical_views

In a letter he wrote:

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 which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this. … For me the Jewish religion like all other religions is an incarnation of the most childish superstitions. And the Jewish people to whom I gladly belong and with whose mentality I have a deep affinity have no different quality for me than all other people. … I cannot see anything ‘chosen’ about them.