Dying is an inevitable part of human life. The Bible reveals God's plan for all humanity that has ever lived, but it may not coincide with what you have been taught.
It may surprise some sincere Christians to learn that the days labeled by many as “Old Testament Jewish days” are part of the legacy left to us by Jesus Christ and the apostles.
Many are not aware of the origins of popular religious holidays, while the days observed in the Bible, and kept by Christ and the Apostles, are almost universally ignored.
The passage in Colossians 2:16, probably more than any other in the Bible, is interpreted by those who reject God's festivals as confirmation that the biblical feast days are unnecessary observances.