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You are one truly confused dude!
The “old covenant” is now the same covenant renewed in Yeshua’s blood.
The covenant is not with any imaginary church, but with the two houses of Israel (Jer 31:31-38)
Obedience to Torah is Yehova’s righteousness.
Faith is the keeping of Yehova’s commandments. Grace is the writing on our hearts of Torah (Romans ch2, Jer ch 31)
Yeshua’s work is not complete. He has fulfilled only the spring feasts. The fall feasts remain to be completed.
Matthew 7: 21-23 reveals the words that most “christians” will hear at the great white throne.
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In is very clear in Hebrews that the old covenant has been replaced by the new covenant. The old must pass away to make room for the new. The old covenant was dependent upon obedience, and the new on faithfulness to the completed work of Jesus, who was fully obedient and fulfilled (completed) the requirements of the old covenant. The later letters of the Apostles also make it clear that anyone holding on to part of the old covenant must keep them all - but they have been fully completed in the sacrifice - once and for all - in Jesus. Living by the law is a lost cause - living by Grace is full Joy!
Please accept your place among the forgiven - just as Adam was before the first sin - in complete communion with God!
THIS I am not confused about!