The apostle Paul now gives a detailed account of his trips to Jerusalem. This was not important in itself, but it had become important because of the false accusations that had been leveled at him.
The false teacher or teachers at Galatia were intimating that Saul was instructed in the rudiments of the Christian faith by the other apostles, which would make him (at best) a second-tier apostle. His adversaries could then claim that as a pupil, he was not a very good one. They, in fact, had gotten the lessons right. This is why Paul had to emphasize that he had not conferred with flesh and blood (v. 16). Not only that, but he did not even go to Jerusalem until three year later (vv. 17-18). When he finally got around to going to Jerusalem, he was there for the very short space of fifteen days—hardly time to get a seminary education (v. 18).
The only other person ranked among the apostles that he saw there was James, the brother of the Lord. This is interesting because James was not numbered among the Twelve, and was apparently not a believer in Jesus until after the resurrection (John 7:5; 1 Cor. 15:7; Acts 1:14). Nevertheless, he came to faith and soon assumed a position of authority in the Jerusalem church (Acts 12:17). Paul acknowledges him as a pillar (2:9) and one of some repute (2:6), and here in this place seems to number him among the apostles. But his acquaintance with James was first made during that two weeks.
So Paul was in Damascus/Arabia/Damascus for three years (Acts 9:19ff; 2 Cor. 11:32-33). He then came to Jerusalem for just over two weeks, and the visit was cut short by an attempt on his life (Acts 9:29). He then went to Tarsus (in Cilicia) for ten years, after which Barnabas brought him down to Antioch (in Syria) for a year. So then, fourteen years after his conversion, he went to Jerusalem for the second time (Gal. 2:1).
Paul mentions his time in Syria and Cilicia here in passing (v. 21). The churches of Judea that were in Christ did not know him (v. 22)—he had spent virtually no time there. They of course had heard of him, but what they heard was simply that a former persecutor had turned preacher (v. 23). They gave glory to God for this (v. 23), which incidentally was not something that the false teachers in Galatian were prepared to do.
Now let us take this back to verse 20. There Paul swears an oath before God. He says that this account of his trips to Jerusalem was absolutely accurate—so help him God. Given this vow, it is nothing short of astounding that there are conservative Bible scholars who identify the Jerusalem visit coming up in Gal. 2 with the Jerusalem council visit of Acts 15. This overlooks the famine relief visit (Acts 11:27-30), and would make Paul’s vow false. Not only that, but it is a vow that is part of inspired Scripture—false. Not only is this unworthy of Paul, and Scripture, it would also be counter-productive for him to take an oath that would give significant leverage to the false teachers in Galatia when they showed (which they could do as soon as the book of Acts came out) that his vow was false. Not only that, but it ignores the inexplicable neglect of any reference to the decisions of the council in Galatians. If Galatians was written after the Jerusalem council, then what was Paul thinking by not mentioning it? Why does he act in this book as though the question were unsettled, when in fact the first great council of the Church had settled it?
We can also see here a biblical pattern for responding to false reports. First, Paul was a man of godly character, known to the Galatians. Second, because of this he was attacked. Third, he responds with a vow—firmly attached to information that could be independantly confirmed.
All things in Scripture are written for our instruction, for our profit. One of the things that we have learned over the last year or so is how many well-meaning Christians do not understand these principles. There is little doubt they would reject Paul’s argument as well—if it were not in the Bible.