@Mr Fight the Power,
Didymos Thomas has corrected the mistaken idea that many of us have had about the First Amendment. It does not, as I claimed at the outset of this discussion, draw any "boundary between government and church". The term "separation of church and state" so commonly used to describe it now is a distortion, really a reversal, of what Thomas Jefferson meant when he used that phrase.
The amendment says exactly what the founders wanted and no more. They chose their words very carefully. They wanted Christian principles to run the nation but they did not want one denomination to run the nation. They wanted to place all sects and denominations of Christians on the same equal footing. The amendment does not provide one whit of support for the court decisions and laws excluding or limiting the churches' political activities..
OK, the churches really do have the right to practice politics. (A move is afoot to challenge the constitutionality of the laws barring such practice.) Now that I understand that, do I still object to their tax exemptions (other than for their charitable operations)? The answer is that I object even more strenuously. Now, I don't even have the satisfaction that I and other non-religious people had of getting something for our money. We were paying the churches to abstain from any direct injection of their faith-driven ideas into our political process. Now, or at least soon, they can inject to their hearts' and souls' content.
Heavy church involvement in politics was not so objectionable in the founders' time. Everyone was religious. Everyone was a Christian. But the times have changed and are continuing to change. Religion is declining.. Secularism is growing. Americans identifying themselves as religious now comprise only about 70% of the adults. Some 14% of them are not even affiliated with an organized religion. The advances of science and research are eliminating the need for words from on high to guide our political behavior.
In the interests of fair and equal treatment of our fast-growing secular segment of society, I believe we should amend the Constitution. This time around we should intentionally and finally separate church from state.
PS: I nearly forgot the main question of this discussion. As you would expect from such an opinionated guy as me, my belief is that we should tax the churches' non-charitable operations.