Of course, Patrick Jane is 100% correct, as far as he went. Also, during Acts, what the 12 and Paul preached to the nation of Israel, in an attempt to convert them, so Israel's Kingdom would be ushered in, was not a salvation gospel, as proven by Paul, in Acts 26:22, "Having therefore obtained help of God, I continue unto this day, witnessing both to small and great, saying none other things than those which the prophets and Moses did say should come: And, he said as late as Acts 28:23, to the Pharisees, "And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening. In both cases, Paul was preaching the Gospel of the Kingdom, the same as Christ preached. Those Jews that believed were born again.
To some of Jews that believed the Gospel of the Kingdom, Paul preached his Gospel of Salvation in 1Cor 15:1-4. This salvation gospel was also preached to the Gentiles. Those Jews and Gentiles that believed Paul's gospel made up the Acts church. The 12 never preached a gospel of Salvation, to anyone. During the Millennium (I think), the 12 will accomplish the Great Commission, which was given to them and ONLY them by Christ. At this time, the Great Commission has not even been started.
It is interesting to note that the phrase, "it is written", appears in Paul's 7 Acts epistles 35 times. but appears "0", that's ZERO, times, in Paul's 7 books written after Acts. It appears 16 times in Romans, the last book Paul wrote during Acts. Acts was 100% Israel, since all the saved Gentiles were grafted into Israel, the good olive tree. The Acts church was hidden in the Prophets, according to Romans 16. The totally different, brand-new, post-Acts church (which was part of The Mystery) was hidden in God, Eph 3:9, and had nothing to do with OT scripture and the prophets. The mystery in Romans 16:25 was the Mystery of Christ, totally different than the Mystery in Paul's post Acts epistles. The saints iafter Acts were chosen BEFORE the foundation of the world, Eph 1:4. The saints in Acts were chosen FROM, or SINCE the beginning, 2Thess 2:13. Huge difference, as is everything when you compare Acts with post-Acts.