For He himself is our peace, who has made the two groups one and has destroyed the barrier, the dividing wall of hostility, by setting aside in his flesh the law with its commands and regulations. His purpose was to create in himself one new humanity out of the two, thus making peace, and in one body to reconcile both of them to God through the cross, by which he put to death their hostility. (Ephesians 2:14-16)
What a radical concept Christian unity is! The fact that in Christ, we are one!
This heavenly reality certainly does not appear to be true when we look around the world. We all come from various backgrounds and cultures, life experiences, and we have our own denominational distinctions. Each person sees the world very differently, and because of this, we are inherently prone to disagree with and distance ourselves from those who are culturally, denominationally, and ethnically distinct from us.
Yes, it is easier to worship with people who look like us, act like us, and have the same theological beliefs as us.