Clearly you didn't bother to read the post your linked to.
We are to give thanks......each and every day, not annually in honor of a man made tradition only. There is nothing wrong with Thanksgiving, its an American Tradition that is just as traditional as the 4th of July......etc., But Thanksgiving is not found in scripture as it is practiced today.
Clearly I did understand.
There is neither Jew nor Gentile. Why attempt to divide the word of God into 2 different covenants when clearly there is only, "One Body, and One Spirit, even as you are called in One Hope of your calling, ONE LORD, ONE FAITH, ONE BAPTISM, ONE GOD AND FATHER OF ALL, who is above all, and through all, and in you all." -- Eph. 4:4-6
The OLD LAW was nailed to the cross of Jesus. If you still live under the Old Law you must live by ALL THE LAW. Where are the animal sacrifices? If you are attempting to live under 2 Laws you are committing "spiritual adultery", (Romans 7:1-4)
To attempt to pull even one ordinance from the Old Law such as the command for circumcision, servers our relationship with Christ Jesus (Gal. 5:2-4)
There is a problem with the Old Law......it was limited in its application. God was not at fault......He offered salvation by the letter of the law, the problem was man and his continued sinful ways.
Example: the yearly animal sacrifice, i.e., atonement sacrifices that were offered each year for sins. This proves the fact there was no actual permanent atonement for sins......these annual sacrifices simply postponed the consequences. (Hebrews 10) Whereas the New Testament Covenant of Christ was built upon the ideology of One Perfect Sacrifice.....the death of Jesus Christ, who fulfilled the requirements of the Old Law to usher in the New Testament Covenant of Christ........that included the JEWS first and foremost as the gospel was preached exclusively to the Jews for the 1st 10 years of the infant church.
The first Gentile convert was a Roman Solider, a commander of a legion (1000 troops) by the name of Cornelius (Acts 10:1-48)
And just as God had saved a remanent before (Noah)....there was a faithful remanent of the Hebrew faith that accepted Jesus as the Messiah of prophecy.......the rest can be grafted back in when they are ready to accept Jesus as the Christ.
As far as their doctrine goes we are to treat the Jews as enemies of the faith (example: Paul confronting Peter, even the apostles were confronted when they attempted to accept parts of the Old Law in order to appease some of the masses -- Gal. 2:11-21)........but we always pray that one day their blindness might be removed so that they also can see. As easily as they were cut off because of a lack of faith......they can just as easily be grafted back in. We are all of ONE FAITH that has progressed over the generations. We are all seeds of Abraham through Christ Jesus. (Gal. 3:28)