A God-fearing atheist?

The NYTimes Aug. 24 article on the fallout from Pat Roberson's call for Chavez's assassination includes this statement:

Yesterday, Mr. Chávez was visiting Mr. Castro in Havana, and shrugged off Mr. Robertson's comments. But Mr. Castro said of the Robertson remark, "I think only God can punish crimes of such magnitude."

I don't know anything about Fidel Castro's personal beliefs, but I have to assume that he, as a staunch defender of the Communist Party's political ideals, would claim to be atheist. Curious comment on his part, to say the least.