[grip_daddy]

Correction first:
Christ is the Lord of the Sabbath, not Lord over Sabbath.

If Christ then is lord over sabbath...his resurrection on Easter Sunday show that he has conqured death and Sunday the new sabbath.

Really? How now? Your statement is very very illogical. Actually what you are saying is that since He is the LORD of the Sabbath, the Sabbath should be kept in His honour. Note that the Seventh Day Sabbath has been referred to as the Lord's day honourable. God called it "My holy day", "The Sabbath of the LORD", "The LORD's Sabbath", "My day". It is the only day that was blessed, sanctified, hallowed and set aside for rest.

If indeed Jesus is the LORD of the Sabbath, then He is the one who rested on the Sabbath after Creation. Then He is the one who made the Sabbath for man. Then He is the one who commanded man to keep the ten commandments. Then it is the ten commandments He referred to when He said, "If you love me, keep my commandments".

Under what reasoning to we substitute Sabbath for Sunday? Your reasoning was not even applied by the early church for Sunday worship, actually no one specifically knows the true reason how Sunday became a dominant day for Christian worship. There are hundreds of documented historical reasons but non takes your argument above.