Factionalism was a problem for the Roman congregations before Paul. Romans 14:1-15:7 indicates that there are some in Rome who considered food laws important enough to be a matter of contention, while others are not taking the food laws as applicable in Christ.
Romans 14:5-7 One man considers one day more sacred than another; another man considers every day alike. Each one should be fully convinced in his own mind. He who regards one day as special, does so to the Lord. He who eats meat, eats to the Lord, for he gives thanks to God; and he who abstains, does so to the Lord and gives thanks to God.
This may indicate divisions between Jewish Christians and Gentile Christians we have seen already by Acts 15 and Galatians. Given the small size of congregations and immense population in Rome, it is likely that the churches functioned as islands of believers (to use Lampe’s word), perhaps initially ethnic enclaves.
Assuming that Philippians was written while Paul was in prison in Rome, it is possible to learn several things about the state of Christianity in Rome in the early 60’s.
Philippians 1:12-14 Now I want you to know, brothers, that what has happened to me has really served to advance the gospel. 13As a result, it has become clear throughout the whole palace guard and to everyone else that I am in chains for Christ. 14Because of my chains, most of the brothers in the Lord have been encouraged to speak the word of God more courageously and fearlessly.
Philippians 4:22 All the saints send you greetings, especially those who belong to Caesar’s household.
We know that Paul was influential in the household of Caesar. He states that the whole palace guard has heard the gospel, presumably from solders converted while they were guarding him. These guards would have been gentiles converted from paganism, as opposed to Jews converted within the synagogue. This indicates that Paul is continuing his two-part mission, to the Jew first and then to the Gentile.
That Paul had success among the Gentiles encouraged the local Roman church to also engage in a similar ministry. As we observed earlier, there was good reason for the Jews to avoid contact with the gentiles based on their expulsion under Claudius in A.D. 49. Romans seems into indicate that the church in Rome was made up of a series of small house churches (Dunn calls them apartment churches, which is more accurate since the poor did not live in houses!)
There is some evidence in Philippians of factionalism. Phil. 1:15 says that some people preach the gospel out of “envy and rivalry” and “false motives.” These opponents of Paul try to stir up trouble for Paul while he is in prison, possibly indicating that there are at least some who “preach the gospel,” meaning that Jesus is the Christ, the crucifixion and the resurrection, etc., but they are doing so in a way that is “against Paul.” This may be personal, but it may also be theological. (Or some combination of the two, of course!)
This may indicate that they disagree with the more radical elements of Paul’s theology, that Gentiles come to Christ apart from the Law, without converting to Judaism. It may be that these rivals opposed Paul and perhaps even disagreed with the Jerusalem council (or, were ignorant of it; or, did not feel that they ought to be bound by it). That there are Jews who would still oppose Paul in Gentile inclusion may indicate an earlier date for Philippians, or that the issue of Gentile inclusion remained a major sticking point for the early church.
It may be something of a surprise to find that there were some congregations in Rome that were openly hostile to Paul, that seems to be the evidence of the book of Philippians.
There is a bit more evidence of factionalism in 1 Clement. This letter was written A. D. 95-97 by Clement, a bishop in Rome. The church of Rome was undergoing persecution when the letter was written (1:1, 7:1) but still felt it important to contact the Corinthian church. According to tradition, Clement was the third bishop of Rome, although it is not at all clear that there was a single unbroken line of bishops who exerted any kind of authority over all of Roman Christianity before the year A. D. 200.
Clement wrote this letter on behalf of the church of Rome to the church of Corinth for the purpose of advising them on certain church matters. The letter was considered to have had some level of authority, although we do not know how it was received by the Corinthians. For our purposes here, 1 Clement 5 is the key text, although Clement returns to Paul in chapter 47.
1 Clement 5:5-7 Because of jealousy and strife Paul by his example pointed out the way to the prize for patient endurance. (6) After he had been seven times in chains, had been driven into exile, had been stoned, and had preached in the East and in the West, he won the genuine glory for his faith, (7) having taught righteousness to the whole world and having reached the farthest limits of the West. Finally, when he had given his testimony before the rulers, he thus departed from the world and went to the holy place, having become an outstanding example of patient endurance. (Translation by Holmes, p. 33.)
While Clement’s evidence is a bit later than Paul’s time, there is at least some evidence of the fact that Paul face opposition in those two years he was in Rome under house arrest.