Christ restored the concept of righteousness to what it was intended to be. Judaism had added unbiblical rules, regulations and legalisms and elevated them to the same status as scripture.
You quotes are appropriate -- for Christian mindset. We are in agreement on that. My disagreement with you is over the OT.
I honestly think that you're mixing in Judiac tradition with what's actually in scripture. But oh well...close enough.
The essence of the NT has nothing whatsoever to do how you worship. Judaic tradition is just that -- a man-made tradition. There is nothing holy about it. Whether I cross myself or not has no bearing on the orthodoxy of my faith.
Judaism and Christianity are mutually exclusive because Christianity recognized the Word in Jesus; Judaism rejected and still rejects Him.
A Jew is considered a Jew even if he is an atheist. A Jew is not considered a Jew if he becomes a Christian. Why? because one does not have to be observant to be a Jew. One only has to lead a righteous life to be acceptable to God. Jews do not believe that man is in need of salvation. To a Jew, Messiah is a a mortal man who will appear to restore Israel (a state) as a dominant kingdom on earth.
But a Christian Jew, by definition, accepted different theology, just as a Jew who converts to Islam is no longer a Jew but a Muslim. As far as Judaism is concerned, he is no longer considered a Jew. Judaism and Islam identify nationality, customs and God's laws all as one and the same. It is Judaism (or Islam) that makes God's laws and man-made traditions one and the same.
Some Christians associate the manner of worship (a man-made tradition) as holy and confuse it with faith. Worship is a manner of expressing praise to the Lord and must not be confused with faith or theology.
Christians have no concept of a Christian "nationality". We differentiate between man-made culture built around faith and faith which is universal. One does not cease being a German if he become an atheist, but he ceases to be a Christian.
Christ did a lot more than just restore the concept of righteousness, my friend. But the bottom line is this: let Judaism be what Judaism is. Christ gave the world a new covenant that should not be confused with the old one.
If there is any confusion between God's laws and man-made traditions, between salvation and works of the law, it is what the NT teaches us to not do.