[GunRunner]

Otherwise, what would be the point of using the Old Testament today?

I find the principles of Jesus and the principles of Joshua quite 'different', to put it mildly.

[Arguendo]

I notice that you’re not a Christian. On the surface OT and NT principles appear quite different, but I don’t think many Christians who have studied the issue (perhaps excluding some dispensationalists—I’m not really sure what they believe) would accept that distinction.