When the LDS scientist Harvey Fletcher took his shot at "introducing the Gospel or planting a seed"(as Mormons say) to the most famous of scientists, Einstein reportedly asked him if dogs would be in heaven. When Fletcher replied in the affirmative, Einstein appeared consoled because he said he loved animals and would like to have a pet in heaven.

I suspect this was one of Einstein's ways of diverting attention from someone trying to proselytize him without making an enemy. I doubt that he really believed dogs or anyone else would go to heaven. He apparently didn't think the Mormon church or any other was the one true church.

Einstein may have been a weak theist, but was probably an agnostic who didn't want to antagonize the world of believers that surrounded him.

I expect that as science progresses there will be fewer and fewer Nobel prize winners and other scientists who are theists.