And who would do that? Christians? How many Christians are there in America? The Episcopalians, the Methodists, the Lutherans, Joel Olsteens community "church." They've gone in support of homos. What kind of strength do you anticipate from the remaining "Christians?"
I have no idea what the answer to that question is. Various people have pushed for it for a long time. Under Obama, I think we have seen a variety of reasons why the IRS-centric tax system may be ripe for replacement.
In no way would I propose that the Fair Tax is an exclusively Christian issue. Many Christians are likely to oppose it. But perhaps some Christians will join the many other segments of society who have come to believe that a Fair Tax is a better way to raise revenue.
I say: the more the merrier.