One promotes worship and another promotes deeds of charity. One promotes holiness of life and another promotes freedom in Christ. They promote themselves much like hamburger chain's promoting their hamburger as the best hamburger. They are faithful to part of God's truth to convince themselves that they are better than others, but they are all the same. When a denomination, church, or individual takes truth out of the context of love, they are no longer promoting God, they are promoting themselves, and the meat has become rotten.
All truth is understood in the context of love.
Love is understood by the nature of God. The nature of God is understood in the life and teaching of Jesus. We know God when we know love, and this begins a life long pilgrimage of learning how much God loves us, and how to love God and our neighbor. God is love and we know the children of God by their love. Any truth which is made to stand in opposition to love is a dead carcass which by its corruption becomes evil.