Doing Away With The Law Of God

There are some Christian denominations that teach that Christ came to do away with the law of God. The commandments they say were nailed to the cross. They teach that the commandments are a burden and some even go as far as saying that the law is evil. Others teach that we are to keep the commandments. Who is right?

What did Christ say about the law? Mat 5:17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill.
Mat 5:18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
If I am to take Christ at His word. Heaven and earth are still here so not one dotting of an I or crossing of a T has passed from the law.

If He came to do away with His Father's commandments why did he tell one who asked Him directly what one had to do to gain eternal life? Mat 19:16 And, behold, one came and said unto him, Good Master, what good thing shall I do, that I may have eternal life?
Mat 19:17 And he said unto him, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments.
Here was the perfect opportunity to say all you have to do is believe in me.

As near as I can see He didn't say anything about doing away with the commandments in fact He expanded them. Mat 5:19 Whosoever therefore shall break one of these least commandments, and shall teach men so, shall be called least in the kingdom of heaven: but whosoever shall do and teach them, he shall be called great in the kingdom of heaven.
Mat 5:20 For I say unto you, that except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no wise enter into the kingdom of heaven.
Mat 5:21 Ye have heard that it was said to them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
Mat 5:22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.

Christ even went as far as saying that those who teach that the law of God is done away with are actually worshipping Him in vain.
Mar 7:7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.
Mar 7:8 For laying aside the commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do.
Mar 7:9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.

If I am to believe Christ and not men He did not come to do away with the commandments.