The Coptic Church is the only Church remaining from the first century. They practiced Judaism from the time of Solomon, and they eagerly accepted Yeshua of Nazareth as HaMessiach.
They practice the Law as given to Moses by Yehova, and as commanded by Yeshua in Matthew Ch 5:17 and John 14:15 and 21, and Matthew 23:3, when He commanded his followers to follow what the Pharisees instructed them to do from the Seat of Moses, but not as the Pharisees do themselves which was additional Rabbinical Traditions.
This is in keeping with Paul's comment in Romans 3:31 "Do we then Nullify the Law through Faith? May it never be! On the Contrary, we establish the Law."
There has been a whole lot of word crafting over the last 2000 thousand years, and deliberate misinterpretation of Paul, who is made to appear to contradict Yeshua. This was warned about also, as the Apostasy, and it has come just as fortold in Scripture.
Everyone should research what can be found about the doctrine of the Nicolasians--there is a severe warning to John from Yeshua about this doctrine in Revelations Ch2.
I think there is much we can learn from the Coptic Church which has been mostly forgotten about, but inspite of infiltration by Jesuits in the 1500's, and the continues persecution from worldly forces around them (Islam), have remained Faithful in every detail. There existence today is a Miracle, but with God all things are possible.