[I don't think we need to get into scriptural semantics as much as we seem to do on these forums. Christianity is basically a 'simple' practice. One's being a Christian will result in their being obedient to the law whether some believe that 'keeping' the law is necessary or not.
I really don't know why this discussion about whether or not we NEED to be obedient persists.
The Law of God is the measuring line, as to where a person is, in their spiritual life.
If they have the truth of God, they obey God's Laws (Isaiah 8:20).
Those that will not obey God's Commandments....know not Jesus Christ:
1 John 2:3 And hereby we do know that we know him, if we keep his commandments.
2:4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
As long as we claim to follow Jesus we WILL be obedient.
Only those who ...LOVE...Jesus Christ, will keep all 10 commandments, (Exodus 20:3-17).
I have no idea why this is so difficult for some to comprehend.
Romans 8:7 Because the carnal mind [is] enmity against God: for it is not subject to the law of God, neither indeed can be.