Having described the experience of Jewish Christians as coming into their full inheritance, Paul described the conversion of Gentiles (non-Jews) in Galatians 4:8-20. Simply speaking, they (we) had not known God but then came to know him. However, the Galatians later turned back to a form of religion that was similar to what they had when they were enslaved to idols. Therefore, they serve as a constant reminder to all of us not to revert to a religion of law-keeping but to continue to trust in Christ alone.
When Peter explained what happened at Cornelius‘s house, the Jewish Christians were amazed that God had given salvation also to non-Jews!
There are two basic principles that enable Christians with differing convictions on debatable matters to live together in harmony in the church.
The model described in Colossians 4:2-6 of ministry to those outside the church is very simple: pray, walk, and talk.