Building a new church really takes some work, especially when you're mixing a ancient faith tradition with a group of brand-new believers. This was the case with the Jews and Gentiles, and Paul was critical to this process. Peter had already received a vision from God that the Gentiles should be included (Acts 10), but the full working out of that new kind of church took time to understand. Paul became the apostle sent specifically to the non-Jewish believers, so that the Church could be more intentional in its building work.