Community = A people with a shared identity and mutual responsibility
The Bible helps us think about community well:
God is, as the Triune God, a community in Himself, existing perfectly, eternally.
Humans have been made in His likeness and created in community with Him and each other.
Sin has affected human community so that we are naturally set against God and each other.
Israel was formed by God as His set apart community, but they failed to live faithfully as His people and demonstrated their need for salvation.
The Gospel announces who Jesus Christ is and what He has done in order to save people from their sins, and anyone who believes in Him is brought into community with God and His people.
What about the church?