"Apostle of the Gentiles" refers specifically to Paul, a prominent figure in early Christianity who was known for bringing the message of Jesus to non-Jewish audiences. There are several synonyms for "Apostle of the Gentiles" that capture the essence of Paul's mission and significance. Some possibilities include "missionary to the non-Jewish world," "evangelist for the Gentiles," or "champion of Christ's message for all people." Each of these phrases emphasizes Paul's role as a bridge-builder between different cultural and religious communities, as well as his tireless efforts to spread the gospel of Jesus to as many people as possible.