Should churches (defined as churches, temples, mosques, synagogues, etc.) remain tax-exempt?

Should churches (defined as churches, temples, mosques, synagogues, etc.) remain tax-exempt? – Read pro and con quotes from religious leaders, scholars, politicians and organizations including the US Supreme Court (pro), famous atheist Richard Dawkins (con), the Becket Fund for Religious Liberty (pro), the Freedom From Religion Foundation (con), the National Council of Churches (pro), and 18th US President Ulysses S. Grant (con).