I’m not sure about your inference that a conservative is the opposite of an atheist. Is then a liberal the opposite of a religious person? Is Methodist Hillary Clinton a conservative?

Einstein made various and conflicting statements about his religious sentiments. We have this:

“Try and penetrate with our limited means the secrets of nature and you will find that, behind all the discernible concatenations, there remains something subtle, intangible and inexplicable. Veneration for this force beyond anything that we can comprehend is my religion. To that extent I am, in point of fact, religious.”

“I believe in Spinoza's God, Who reveals Himself in the lawful harmony of the world, not in a God Who concerns Himself with the fate and the doings of mankind.”