Christians are exempt from the "ceremonial" laws -- no priesthood of men; no sin offerings; no fasting or dietary laws, etc.
This site explains it somewhat better.
http://www.gotquestions.org/antinomianism.html
“People may wonder, “If I am saved by grace and all my sins are forgiven, why not sin all I want?” That thinking is not the result of true conversion because true conversion yields a greater desire to obey, not a lesser one. God’s desire—and our desire when we are regenerated by His Spirit—is that we strive to not sin, out of gratitude for His grace and forgiveness.”
What? Where is that written?