From time to time people speculate whether Einstein was an atheist. Richard Dawkins, for example, said in his book The God Delusion that Einstein was an atheist. However, Einstein addressed this point directly:
I am not an atheist, and I don’t think I can call myself a pantheist.
For sixty years Anthony Flew was an apologist for atheism. Four years ago he announced that he had changed is mind. Last year he published There Is a God, an account of how he first became an atheist and of how decades later he reversed his position.