Why won't Christians keep Torah?

Paul kept the Sabbath. Paul instructed Gentiles to keep the Sabbath. Paul took a Nazirite vow. Paul went to Jerusalem (as commanded in Torah) on Pentecost. Paul told the Corinthians to keep Pover. Paul testified 3 times in court that he was a Law keeper & did not teach Lawlessness. Paul ONLY said that the Law was not the vehicle by which salvation comes, but said it was great in EVERY respect, & without it he wouldn't know what sin was. Jesus said heaven & earth would p away before one stroke of a pen was removed. He also told us to live as He did. New Covenant says that the Torah, not another law, will be written on our hearts in a time when the whole world will know God (which clearly has not yet come to p). God said the Torah was eternal. The Torah was given to a mixed multitude of Jews & Gentiles, & it is repeated over 50 times in the Law that Torah was an eternal command for all believers regardless of nationality. The commanded Holy days teach about prophesy, including events still in the future (whereas Christmas & Easter are pagan adaptations which teach nothing about the Bible, & are actually forbidden by Torah). Revelation says that the remnant will still be keeping Torah, & Isaiah says that sacrifice will commense once again when the Temple is rebuilt.