Usually they don't. They teach the law/torah was 'nailed to the cross', or at least that old 4th. commandment is just 'for Jews', but the others still apply. Funny thing is, they are all claiming the 'new covenant'.
Well, that's a quandry too, since it is only made with the house of Israel and it is ALL ABOUT the torah to be written upon the heart!
Christianity is a funny thing. The majority doesn't follow the Scriptures unless it suits them.
Thats gonna be a problem some day.