Flavor 1: ReligiousPerson A: I think on the whole it's moral to do X, and we should all strive to make sure X obtains through ways A, B and C. I believe this owing to either God or philosophy which ultimately indicates a theistic world or a world of intrinsic purposes with lasting consequences.
Me: Interesting. Tell me why you think that. What premises, what revelation, are in play here? I will try to evaluate how much credence I put in all of these, where I agree and disagree, and we can continue accordingly.
Flavor 2: Irreligious
Person B: I think on the whole it's moral to do X, and we should all strive to make sure X obtains through ways A, B and C. I reject the existence of God and think the entire universe is a purposeless machine, but if we assume certain ethical stances we...
Me: Do you have a gun?
Person B: Well, no.
Me: Are there a lot of people who believe you who have guns and a willingness to use them?
Person B: No..?
Me: Great. We're done.
Person B: But, utilitarian ethics according to Singer would indicate...
Me: Don't care. I'll do as I please. Fuck off.