We follow the example of Jesus who kept the feasts
Faith in Jesus should not contradict the faith of Jesus Joseph, Mary, the disciples, and Paul kept the feasts. God sees you either as Israel or grafted into Israel (Rom. 11:17) Whether your believe His commands in Leviticus 23 are for Jews alone or for all believers, He certainly thinks these feasts are a good idea as evidenced by His command (repeated six times) that they are to be “a statue forever throughout your generations”
(Leviticus 23:14, 21, 31, 41; Exodus 12:14, 17)