Not sure. But how does a silly little car decal make anything a religion? Does having a an ichthys on your automobile automatically make you a christian?
Does defacing a Christian symbol to create an imaginary quadruped fish that is supposed to be "evolved," and placing it on your automobile mean anything other than that the driver just enjoys mocking Christians?
For that matter - are any product logo or university decal an indication that you worship them? More silliness, nothing to see here.
It means that you are telling people you are.
You know, it would be kind of neat to make up a symbol supporting a belief in the conservation of energy. I guess if I put it on my car that would make me a physicist. :-)