A letter from Einstein to Eric Gutkind sent in 1954 is up for auction.
It is rather blunt.
“…The word God is for me nothing more than the expression and product of human weaknesses, the Bible a collection of honourable, but still primitive legends which are nevertheless pretty childish. No interpretation no matter how subtle can (for me) change this.”
The rest is worth reading.
Not that it will put an end to the claims to appropriate Einstein as a theist, or even a monotheist, but it is interesting.
Full Grauniad story here: “…Despite his categorical rejection of conventional religion, Brooke said that Einstein became angry when his views were appropriated by evangelists for atheism. He was offended by their lack of humility”
And their blog discussion on it