Right, well I might (emphasis on "might") be looking towards singing up on PTA. The only problems that I've got are coming up with personalities of the Pokémon that I'm with, & especially coming up with a name for my character. Everything else I've got covered, mostly anyway.
That's depressing. I was thinking that maybe someone would try to call out to Celebi one way or another, perhaps by building a shrine to Celebi, like the one in Ilex Forest. But this tosses the concept out the window...
You seem to be missing the point. There is no faith required to believe in Arceus. Arceus is readily observable. He has even been known to tell us what he wants. Religion is faith based. Hence, the study of Arceus, what he does, and praise he recieves is probably not going to resemble a religion in any way.
It would be like if the people of Metropolis started worshiping Superman. No faith required. Say hi to him and invite him for a coffee next time you see him.
Or if we started worshiping a celebrity. It's just not the same when the thing you're worshiping is readily observable.