Sacrifice for Yahweh

Should Christians keep the Feast Days? This is the question that many ask when they read so many passages in the Old and New Testaments regarding Yahweh's Feasts. Many believe that these Feasts are "Jewish" but scripture tells us these Feasts Israel kept are "Yahweh's" Feasts. Did Paul keep the Feasts? Does the New Testament teach Feast keeping? Are the Feasts a burden to the believer and done away with?