Good grief!
Who is the "we" who is going to re-write the US Constitution?
Congress? It would take 2/3 of both houses and three quarters of the state to pass a "re-write".
A constitutional convention? Liberals and conservatives are opposed to it. AND, it would still take 3/4 of the states to pass it.
BTW,
A tax on churches, per se, would not violate the First Amendment, provided it applied to all houses of worship equally. The tax laws of this country grant tax-exemption to churches because of their charitable and community work, and because they are not set up as for-profit businesses (although some people dispute the latter), NOT to help them promote their religious POV.