As I'm sure all of you know, the Old Testament is the Hebrew bible. Why then do Christians not follow the same rules as the Jews? When Christianity was attracting attention, Paul said that Jews who converted had to follow the Jewish law, but gentiles did not. If the halacha (Jewish law) is still technically in the Christian bible, then why are things like keeping Kosher are not observed by Christians?
Also, if a Jew were to convert today, do they use Paul's idea, or stop following Jewish law (obviously it's up to the person, but is there any evidence to suggest that that's how it should be done)?