Albert Einstein's views on religion and the concept of God are complex and have been a subject of much debate. While Einstein did not adhere to any traditional religious beliefs and was often seen as a non-theist or agnostic, he did express a sense of wonder and awe toward the beauty and harmony of the natural world.
As for Spinoza's concept of God, Baruch Spinoza was a 17th-century philosopher who proposed a pantheistic view of God, where God and nature are essentially the same. It is often described as a form of monism, suggesting that everything in the universe is interconnected and part of a single substance, which Spinoza referred to as God or Nature.
Einstein admired Spinoza and spoke positively of him on several occasions, but whether or not Einstein fully embraced Spinoza's concept of God is a matter of interpretation. Einstein was known to reject the notion of a personal, interventionist God, but he often used the term "God" in a metaphorical or poetic sense to describe the laws and order of the universe. For him, "God" represented the underlying rationality and elegance of the natural world that could be grasped through scientific understanding.
In a letter to a philosopher Eric Gutkind in 1954, Einstein referred to himself as a "deeply religious nonbeliever." He explained that his religious feelings were connected to a sense of humility and awe in the face of the cosmic order but were not tied to any conventional religious doctrines.
In summary, while Einstein did appreciate aspects of Spinoza's philosophy and shared a reverence for the beauty of the universe, it is difficult to definitively state whether he fully subscribed to Spinoza's conception of God. Einstein's own beliefs and descriptions of his religious views were nuanced and evolved throughout his life.