God is love. Jesus said if you love me you will obey my commandments. Obedience to Christ is the fruit of love it is not the tree. Jesus Christ is the tree of life, the God who is love. There is no fruit without the tree. There is no love without trust in Jesus Christ. Good deeds apart from Christ may look like the fruit of love but without Jesus Christ, the tree of love, they cannot be.
"God is love" is much different than "love is God." "God is love" does not mean that we should define God by what we think love is. "God is love" means we should define love by who God truly is.