We followers of Spinoza see our God in the wonderful order and lawfulness of all that exists and in its soul ("Beseeltheit") as it reveals itself in man and animal. It is a different question whether belief in a personal God should be contested. Freud endorsed this view in his latest publication. I myself would never engage in such a task. For such a belief seems to me preferable to the lack of any transcendental outlook of life, and I wonder whether one can ever successfully render to the majority of mankind a more sublime means in order to satisfy its metaphysical needs.

From a letter to Eduard Büsching (25 October 1929) after Büsching sent Einstein a copy of his book Es gibt keinen Gott [There Is no God]. Einstein responded that the book only dealt with the concept of a personal God, p. 51 - Einstein and Religion (1999)