MoreCoffee,
re: "Don't the vast majority of Christians believe that the Lord, Jesus Christ, was crucified, died, and was buried on Good Friday..."
I think that the majority do. However, it doesn't seem that any of them look in on this topic - at least none who believe that the "heart of the earth" is referring to the tomb or at the earliest to the moment when the Messiah's spirit left His body, and who try to reconcile the lack of a 3rd night by saying that the Messiah was employing a common figure of speech of the time.