Yes, I've also thought of governments and religions as competing organisms. Surviving and evolving over millenia, passing on memetic information instead of genetic. Using every trick in the book to survive, multiply and kill competitors.
I still carry a little faith that a more symbiotic ( to humans and environment ) parasite may become the winning one some day. Maybe technology like bitcoin will help us with that.
Reminded me of this vid:
http://www.youtube.com/watch?v=H6b70TUbdfsI love Larkin Rose. He and I started doing videos on anarchism about the same time on YT. Difference being, his are good and mine were not

Well, I had a decent following, but I thought I could do far better.
At any rate, the only disagreement I have with your reply is that I don't see that much competition between religion and government. They tend to be symbiotes, though who is dominant changes.