They do study that in seminary
...however, that doesn't stop Christian leaders from having divergent views on the matter. There are three main views:
1. Everything in the Old Testament is to be "brought down"--Christians are responsible to keep all of the Old Law.
2. Nothing is transferred--Christians can do whatever they want. Throw away the Old Testament.
3. (What my college taught:) Jesus gave the apostles authority to interpret the events of his life and how they relate to the Old Covenant. Pay attention to what the apostles paid attention to. If they talk about homosexuality, and refer to the Law as a good thing on that issue, they're probably right. If they never mention pork or linen, why should we quibble over it?
