That's not what the constitution says though. Read it. I qouted it word for word above.

However, a group HAVING a religious affiliation and abiding by the rules of their religion does NOT necessarily equal "religious activity" - no does their accepting or seeking funds from any government necessarily mean the government is promoting their religion.

Following your logic no practicing person of religion should recieve ANY governmental services - I assume this would include medicare, social security, police protection, the services of the court. I suspect they shouldn't be allowed to drive on roadways built with govermental money, either, should they? or eat crops subsidized by federal funds? It's probably violating the sonstitution to allow them to vote!