Before this thread gets completely hijacked by debates on the finer points of religious dogma, let me add my personal "welcome" to southern.finesse!
A court room style discussion with your wife is actually a really neat idea, and I'm sure it will prove to be quite revealing.
When I was younger and just starting to make my own decisions about things my family did something similar where my mother would require me to debate the pros and cons of the idea with her. I was then allowed to make my own decision in most cases, but only after discussing both sides of the issue. It led to some interesting conversations! I personlly think this is a good idea not only for kids, but adults too who are trying to get the best possible information. Everyone needs a sounding board from time to time, and people who don't think the way we do or are coming from a different perspective only cause us to re-evaluate our thoughts from new angles. Done well, this can be highly constructive.
Hopefully your dinnertime discussions won't devolve into adversarial positions (not that ours did), but remain open. It sounds like this is what you're going for, so I wish you the very best!