The First Amendment reads: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."
Proponents of tax exemption for churches make the argument that it keeps the state from the church - i.e. if the church pays no tax, they won't try to influence the government. Churches provide many services to the public and should be tax exempt. Many people would suffer if churches had less resources available to them. Generally, it's seen as a constitutional right.
Opponents of tax exemption for churches make the argument that it violates the separation of church and state, and the government is losing out on serious tax revenues. According to one estimate, churches own over $300-$500bn of property, and New York City alone is losing out on $627m in tax revenues. While nonprofits have to file a tax return, but might not have to pay tax, churches don't even have to file a tax return. Huge amounts of taxes are not being collected, with $82.5 billion as a very conservative estimate.
So, what does NSG think? Should churches/religious organizations receive special tax-exempt status?