Do Jehovah's Witnesses celebrate Jewish holidays since they do not have pagan roots?

Jehovah's Witnesses do not observe the ancient Jewish holidays because these are associated with the Mosiac Law which was done away with by Christ Jesus' sacrifice. Jehovah's Witnesses excercise faith in Jesus and observe the Law of the Christ rather than holding to those pre-Christian observances.-(Galatians 6:2)

The ancient Jewish holidays were required by the Mosiac Law covenant. The most well-known part of that law was the Ten Commandments, but there were some 300 other laws and requirements that included festivals, holidays, and various sabbaths.

Whe referring to that law, Paul stated at Romans 7:6,7, that Christians have been "discharged from theLaw.", that is, that old Mosiac Law.

At Romans 10:4, we are told that, " Christ is the end of the Law, so that everyone exercising faith may have righteousness."

Colossians 10:6, says that God "kindly forgave us all our trespasses and blotted out the handwritten document against us, which consisted of decrees and which was in opposition to us . . .Therefore let no man judge you in eating and drinking" or "in respect of a festival or of an observance of the new moon or of a sabbath."

So the festivals and holidays required by the Law would not be required on those excercising faith in Jesus.

Christians are not under that Law covenant. The Mosiac Law was to be a "tutor leading to Christ."-(Galatians 3:24) Therefore, when Christ came and proved faithful, he could say that he fullfilled the Law. -(Matthew 5:17) That is why Paul could write years later that the Law was "nailed to the stake" along with Christ.-(Colossians 3:13,14)