Topic: Formatting of Bible, New Testament, and Old Testament?

Does anyone know whether Bible, New Testament, and Old Testament should be italicized in writing? The editor's blog I posted to this forum says that the name of books within fiction (e.g., in the narrative/dialogue) should be placed in italics (e.g., Bible) but that chapter titles should be placed in quotes (e.g., "Genesis").

Do you agree that Bible should be italicized? Should all references to Genesis (or other parts of the Bible) always be in quotes? I'm also inclined to treat New Testament and Old Testament the same as Bible, since they're more like books than chapters.