Popper says “I don’t know whether God exists or not.” and ” I do think that all men, including myself, are religious.”
Also “I would be glad if God were to exist, to be able to concentrate my feeling of gratitude on some sort of person to whom one would be grateful. This is a wonderful world in spite of the mess that bad philosophers and bad theologians have made of it. They are to be blamed for many wars and for much cruelty.”