Aczel is wrong. He didn't. Einstein was a monistic humanist. He said he believed in "the god of Spinoza" which basically makes him an atheist. Einstein used the term "superpersonal" to describe his god, and this peculiar term was coined by Paul Carus, editor of The Monist journal. Monism, popularized by Ernst Haeckel, was supposed to be a religion for scientists. Monism is a kind of Spinoza-lite pantheism. Many scientists in those times, especially evolutionists, adopted monism and promoted monism.
ya, I pretty much agree with you on this.
But I have a number of Amir D. Aczel’s books and really enjoy them.