Well you can be whatever you want. But in the New Testament God makes it clear that he does not change. He is the same God in the Old and New Testament. So in all actuality there is no such thing as a New Testament Christian, because to reject part of God’s Word is the same as rejecting Jesus Himself, because he is the Word. And that my friend, you can find in the New Testament.
Some reason I find it hard to believe you are actually following all the rules of the old testament. What do you do for the year of jubilee?