In my opinion, the factual difference is that religion is comprised of opinion as to fact, and politics is comprised of opinion as to policy. For instance, it is a religious question as to what is the difference between politics and religion. It is a political question what policys should be in effect regarding the difference between politics and religion. Or, it is a religious question which text editor is better, Vi, or Emacs. It is a political question which text editor a software house will use, Vi or Emacs.