That's because you don't understand it. Some people throw out the whole book of Revelation because they don't understand it.
What you need to understand with spiritual things, is that everything is
hierarchically structured, and vertically integrated. As man moves up the spiritual scale, or rather, as God moves him up by enhancing the relevation of himself, things drop out at the bottom end. Christians are required to be concerned for the spiritual law.
In times of old, it was spiritual to obey certain rules and regulations, for sure, because they affected health and well-being. But the "do not touch, do not taste, do not eat" laws have been superseded, by the command of the apostles. Also accomodation had to be made for the Gentiles. However I think you find most law relating to human behavioural interaction remain pretty much intact under the NT, or is even increased under Christ.