The simple act of saying 'thank you' is a demonstration of gratitude in response to an experience that was meaningful to a customer or citizen.
History does not record anywhere at any time a religion that has any rational basis. Religion is a crutch for people not strong enough to stand up to the unknown without help. But, like dandruff, most people do have a religion and spend time and money on it and seem to derive considerable pleasure from fiddling with it.