Religion is very swift to observe the part about not diminishing any of God's commandments, but there seems to be an unwritten law that adding to them is okay. Every denomination has its own set of "do's and don'ts" which aren't found in bible, and like those of the hypocritical Pharisees, their unwritten laws usually have to do with outward appearance.
We need to remember that adding to God's commandments is just as bad as taking away from them. We need to speak when the Bible speaks, and be silent when the Bible is silent.
The commandments of God and the traditions of men are not the same thing and must always be clearly distinguished. Any attempt to place them on the same level will always result in making the Word of God of none effect.
We either "lay aside" the commandment of God to keep the traditions of men or we "lay aside" the traditions of men to keep the commandments of God (Exodus 20:3).
Church liturgy is tradition, as well as many of the "do's and don'ts" taught by churches. We can neutralize the positive power of God's Word toward us, and nothing will do that quicker than elevating man's traditions above God's Word. God's Word is still true (Romans 3:3-4) and will not return to Him void (Isaiah 55:11).
The Word will not profit anyone who doesn't believe it, but God's Word itself doesn't lose any power. If some do not believe God's Word, does that make God's Word of no effect? Only to them.
God's Word still has its power to save, and it will profit us when it is mixed with faith.