" Scientific materialists, who regard all forms of religious belief as superstition, are often puzzled, even embarrassed, by Albert Einstein's frequent remarks about God."

Puzzled, yes. Embarrassed, no. Albert Einstein, while he denied being an atheist, also vigorously denied believing in a personal god. This and the fact that when he described the only sense in which he considered himself religious are confusing because most atheists have a hard time parsing "a belief in god that is not a personal god." Why call the sum total of natural law "God?"