That is a good question indeed; and the unfortunate reality that leads to our answer, is that most people that profess to be Christians, are not really Christians at all…
According to the Bible, a Christian is a disciple of the Lord Jesus Christ (Acts 11:26, 1 Peter 4:16).
Jesus our Lord is the King of the Jews, and the Bible says that he was “made of a woman, made under the law.” (Galatians 4:4)
He kept the Jewish feast days, including sabbath days, because he was a Jewish Rabbi, who lived and laid down his life during the time of the Old Testament.
(Everything that we read in the four gospels of Matthew, Mark, Luke, and John, is a record of things that were done and said during the time of the Old Testament.)
50 days after Jesus’ glorious resurrection, the New Testament began on the day of Pentecost. You can read about this in the book of the Acts of the Apostles, chapter 2.
From the time that the New Testament began, the apostles that Jesus had chosen and ordained began to preach the New Testament gospel (Acts 2:38); and from that day forward they NEVER taught anyone that we must keep the Jewish feasts and customs in order to serve God. On the contrary, they taught that trying to keep the carnal ordinances of the law makes void the sacrifice of Christ.
As Paul wrote,
“Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.”
Galatians 2:16
And that same apostle Paul also wrote in the fourth chapter:
“But now, after that ye have known God, or rather are known of God, how turn ye again to the weak and beggarly elements, whereunto ye desire again to be in bondage?
Ye observe days, and months, and times, and years.
I am afraid of you, lest I have bestowed upon you labour in vain.”
Galatians 4:9-11
So, if we wish to be disciples of Jesus Christ, then we must believe the word that he gave to his holy apostles to give to us; for the Lord Jesus prayed to God concerning them (and us):
“Neither pray I for these alone, but for them also which shall believe on me through their word;
“Neither pray I for these alone, but for them also which shall believe on me through their word;
That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.”
John 17:20,21
Christians do not observe Hebrew traditions; unless they were raised in those traditions, and feel that they must keep them as a matter of conscience, until such time as they grow in Christ, and learn that those things are not necessary, as Paul taught in Romans 14, concerning abstaining from certain meats and the keeping of sabbath days.
But if a man was not raised up in those Jewish customs, and desires to be a Christian, then there is no good reason for him to be observing them.
Where do people learn to do such things, then?
From wicked men who are false teachers, and from reading perverted Bibles and other perverted literature written by antichrist Jews who reject the word of God and their own Messiah.
(In English, God’s word is preserved for us in the Holy Bible, King James Version.)
Amen.