You're arguing against straw men claims that CN's never make.
Christian nationalism is not a theocracy, nor does it advocate for one. It advocates for basing law on a Christian moral framework because laws are simply moral "ought" claims, not just "I want because .. feels".
We supposedly already have that, since the legal system is based on the Byzantine Justinian Code, but that's being dismantled at record pace as you're seeing in real time.