If you stopped there your interpretation that God's LAW stopped at John might seem correct. But the next few verses you leave out undoes your interpretation of the sctiptures. Let's add them all together and show what you have left out that changes the meaning your trying to put on the scriptures.
LUKE 16:16-18 [16] The law and the prophets were until John: since that time the kingdom of God is preached, and every man presses into it. [17],
And it is easier for heaven and earth to pass, than one dot of the law to fail. [18], Whosoever puts away his wife, and marries another,
commits adultery: and whosoever marries her that is put away from her husband
commits adultery.
Yep seems the next two verses you left out goes against your teachings here. You may want to re-visit the scriptures? If God's 10 commandments were until John then Jesus would not be teaching them after John. Not to mention all the Apostles after the death of Jesus.
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Matthew tells the same story here...
MATTHEW 5:17-19 [17] Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill. [18],
For verily I say unto you, Till heaven and earth pass away, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. [19],
Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
Hope this helps..