Most people recognize the need for authority in our lives. That's why we have policemen, sheriffs, and government in general. Laws are in place to keep things orderly so we may live peaceably and harmoniously in the world today.
The same is true in religion. There is a recognizable need for authority in matters pertaining to what God would have us to do. Christ said in Matthew 28:18, "All authority has been given to me in Heaven and on earth." Christ is the one who is in charge. All authority is inclusive of everything regarding our religious practices.
Men have often thought of ways they think are better than the ones Christ gave. They have added many things to worship and practice of religion that are not found in God's word, the New Testament. Furthermore, some even set themselves up as "Christ's vicar on earth." There must be one standard, otherwise there is chaos, and this is what we see in the religious world around us. The prophet Isaiah said of God's authority, "For as the heavens are higher than the earth, so are my ways higher than your ways, and My thoughts higher than your thoughts," (Isaiah 55:9)
God is in charge. He has set down the rules for how he wants to be worshipped and served. It is not man's place to add or take away from God's plan.