Some congregational song ideas on the theme of Christian Unity (in no particular order):

House United — People and Songs

Make Us One — Jesus Culture

ONE Song

United — Dan Loewen

Oh How Good It Is — Keith & Kristyn Getty

They Will Know We are Christians By Our Love (King and Country version)

Make Us One — Twila Paris

Make Us One — Phil Driscoll

Father, Make Us One — Scripture in Song

Make Us One — Ft. Naomi Raine

Psalm 33 (Unity) by Jacob Sciacchitano (lead sheet)

The Church’s One Foundation — hymn