I believe in Spinoza’s God who reveals himself in the harmony of all that exists. 
The firm belief, a belief bound up with deep feeling, in a superior mind that reveals itself in the world of experience, represents my conception of God. In common parlance this may be described as “pantheistic” (Spinoza). 
Given these statements by Einstein himself, it seems that he did not consider himself a Buddhist.
1. Einstein, Albert. The Expanded Quotable Einstein. Calaprice, Alice, ed. (Princeton: Princeton University Press, 2000). p. 204.
2. Einstein, Albert. Ideas and Opinions. (New York: Crown Publishers, 1954). p. 262.
Cf.The Dicey Problem of New Age Science, Dwaraknath Reddy (Dwaraknath Reddy,2002)