Brother, I'm confused. You say we aren't under the OT laws, but when were they annulled? Jesus told us plainly in Matthew 5:17-19 where He stood with the Law, and heaven and earth have yet to pass, so...
The way I've understood it is that the Law still in effect, but we aren't bound to the law as we were before Calvary. This is what Paul wrote about frequently and still causes too much debate today. The Law is eternal, it is perfect and is written in our hearts. But if we allow the law to govern our lives to the point of ritualism, we run into a severe problem. Suddenly, the law can become the idol.. i.e. I know several Christians that abstain from eating pork. Yes, the scripture commands this, and modern studies have proven just how disgusting these animals truly are. But I dont think that will relate to us in the Kingdom, its for our own health. Say, we learn that pork is a leading factor in cancer and many other illnesses, yet we still choose to eat it frequently. Should we blame God for allowing us to get sick, or ourselves for not obeying? I don't believe that any man can achieve the entire law, as it is all but impossible. But I think that trying, at least, makes the difference.
1 John 3:4 teaches that sin is transgression of the law, so if the law is no longer in effect, then there can be no more sin... Jesus taught " 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." in Matt 5:19 So we should be very careful about what we teach. From this one verse, I can see plainly that by NOT doing the law and teaching others the same, I will be considered LEAST in the kingdom to come. So I would rather err on the side of caution, than not.
The law is not the offense, it is mans own self righteousness that causes problems. The Pharisees believed they were better than everyone around them because they 'kept' the law, yet Jesus pointed out to them their hypocrisy on numerous occasions. If the law is no longer in effect, then we have nothing to base our 'works' on nor do we have any means of knowing what 'sin' is. This is just my understanding however, so please share with me some wisdom kinsmen.