[lapcat]

> 2. "B" interpreted "X" as "Y" and used that as a guide to action.

This is missing something essential: did B correctly or incorrectly interpret X as Y?

The argument is that if B had correctly interpreted X, and used X as a guide to action, then B's actions would have been quite different from what they are.

It would be strange to say, "Who cares about what Jesus said? We're only interested in what contemporary Christians are doing." It's strange because contemporary Christians themselves claim that they are following Jesus and care what Jesus said. If they've grossly misinterpreted Jesus, then that's a legitimate criticism of their beliefs and actions.