How can we live in harmony? First we need to know we are all deeply in love with the same God.
When you look at those around you, start with the basic understanding that all Christians love and follow the same Lord. Spend time getting to know and sharing your faith with the larger body of believers. When it comes down to it, we may have different traditions, but we all love Jesus and serve the same God. That’s how we live in harmony.
Love the LORD your God with all your heart and with all your soul and with all your strength.
Deuteronomy 6:5 (NABRE)