Are there any 'New Testament Christians' who ignore the Old Testament?

If so isn't there something which Jesus said about following 'every jot & tittle of the law until heaven and earth pass away' regarding the Old Testament? What else could that mean except: 'It's ALL gotta be followed to the letter'? Why did Paul say that you are no longer under the law? Is he more authoritative than Jesus? How? He's not the son of God.
 
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