That sounds a bit like "pick and choose" to me. Actually the statement that Paul made in your quoted scripture, was that under the "old" law, there was no place for forgiveness and transgression lead to death, without pardon. Under the "new" law there was:
- no necessity for sacrifices anymore, since "type had met antitype" in the crucifixion of Christ (The Lamb)"
- Grace for sin; as we surrender our heart to Christ, our sinful characters are exchanged with Christ's sinless character
This all makes perfect sense; why? Well, if Christ would have come here to "do away" with the 10 Commandments, He would have actually contradicted Himself. He clearly stated in Matthew 5:17-19:
17Think not that I am come to destroy the law, or the prophets:
I am not come to destroy, but to fulfil. 18For 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.
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.
(emphasis added)
I think one of the reasons for society rapidly going south today and people living in total confusion about morality is the idea that the 10 Commandments (our moral standards) would be any less valid today as they were in Moses days.
The abandonment of the fourth commandment has no biblical ground whatsoever, but was executed by the Roman Emperor Constantine and adopted into Roman Catholic Church tradition. Even well known Catholic scholars recognize that there is no Biblical authority for changing the seventh day Sabbath into Sunday.