1There is therefore now no condemnation to them which are a) in Christ Jesus, and b) who walk not after the flesh, but after the Spirit.
This is a conditional statement. The criteria has to be met in order to walk 'in Messiah' with no condemnation.
If you walk according to the flesh, and have your mind set upon the flesh, there will experience condemnation. If your mind is set upon what the Spirit desires, you will reap life and peace. The law has been written upon our HEARTS if we are IN HIM. We should not sin, because we should have the inner impulse to naturally do what is right and be in line with His commandments. The commands are not grievous - just look thru the NT and you will find command after command. The statutes of the old testament are repeated in the new, if you look for them!
If we sin, we have an advocate--but God is still concerned with sin. This season IS about judgment of the wicked and unbelieving - those who continue to commit their sorceries no matter what: