My point was that there is a respectable scientific claim that animals can be superstitious. That can be construed as partway toward being religious, depending on the extent an observer equates religion with superstition.I've read about Skinner's Pigeons in recent psychology textbooks. I believe zoobyshoe was using that as an example. This was a classic experiment, not to mention the fact that the web page was called psychology Classics. This is a real effect. People debate about for Skinner's experiment, but only in the context of whether it is operant conditioning or classical.
For my money, the more primitive the religion the more it is a collection of superstitions aimed at trying to control the external world: the weather, the hunt, personal safety, etc.