Rude thing to say?. If you educate yourself in history you would very early realise that Religion was most likely a minor practice exploited and abused by few to control a larger part of the population. Religion has always been used to manipulate a larger group of people, just look at the Islam radikals, Christians Crusades etc.
Religion is indeed a belief, but the way it originated and the way it has been used has been against it's intention.
As for the purity ring I see no reason as to not obtain it. Many people be it believers or non believers does share the same ideals as the purity ring is trying to emphasize.