Our relationships with others should not compromise our faith. It's in the Bible, II Corinthians 6:14, TLB. "Don't be teamed with those who do not love the Lord, for what do the people of God have in common with the people of sin? How can light live with darkness?"
Our relationships with others are made possible through Jesus. It's in the Bible, Ephesians 2:21-22, TLB. "We who believe are carefully joined together with Christ as parts of a beautiful, constantly growing temple for God. And you also are joined with Him and with each other by the Spirit and are part of this dwelling place of God."
We become like the people we associate with. It's in the Bible, Proverbs 13:20, NIV. "He who walks with the wise grows wise, but a companion of fools suffers harm."