Interestingly, it may not be necessary to bring up Church/state separation to get it bounced. If it's retroactive, that makes it an ex post facto law. And well,
I grew up in Missouri, although I don't live there now. I had to pass a test on the state constitution in high school, and thought I remembered this clause.
Missouri Constitution Article I, Section 10 Wrote:Section 10. Powers denied to states.— No state shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; emit bills of credit; make anything but gold and silver coin a tender in payment of debts; pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts, or grant any title of nobility.
I grew up in Missouri, although I don't live there now. I had to pass a test on the state constitution in high school, and thought I remembered this clause.