But what about those of us who Christ has saved? We are members of the New Covenant. Do we have to follow the OT law?
The answer is a resounding NO.
The OT law, with its connection to the Old Covenant, no longer has any bearing upon us. What matters now is faith. It is faith that saves through our union with Jesus Christ and His perfection. Paul tells us in Galatians 2:16-17, "...yet we know that a person is not justified by works of the law but through faith in Jesus Christ, so we also have believed in Christ Jesus, in order to be justified by faith in Christ and not by works of the law, because by works of the law no one will be justified."
In order to be found not guilty of transgressing the OT law, we must be one with Jesus Christ. This only occurs through faith. Trying to follow the OT law is fruitless and actually shows a lack of faith in what Jesus has already accomplished. The law no longer has any grip upon us; why would we turn back to it?
A significant problem in the church today is that many Christians act as if at least some of the OT law still applies. They point back to the OT to say that we must meet on Sundays (Sabbath regulations), we should have a big building (OT temple), and that we should pay pastors (OT priests). These interpretations break down in many different places, but for our purpose here I just want to focus on the big picture. If these OT forms still apply, it means that the entire law still applies to those in the New Covenant. If it does, then the gospel means nothing!
The gospel has freed us from OT law restrictions. Christ has unshackled us from that law to follow His law: Galatians 6:2 says, "Bear one another's burdens, and so fulfill the law of Christ." We've been freed to live lives of faith, enjoying Christ fully.
Please do not allow other well-intentioned Christians to convince you that the OT law still applies. Quite simply, it does not. The OT law should not be used as any sort of support for current church forms and practices. When this happens, problems quickly arise. We are members of the New Covenant. We ought to be looking to the New Covenant to show us what church life must look like. Christ has freed us to do so.