Wrong - the problem is that there is no biblical evidence exists to support the view that anyone at Pentecost recognized that the Church, i.e. the Body of Christ, had come into existence. On the contrary, the biblical evidence indicates that at Pentecost the Twelve knew nothing about the Body of Christ. The apostle Paul is the only biblical writer who reveals the Church as the Body of Christ. No other Bible writer mentions it.
There are many believers today who do not understand what their spiritual gifts are.
It took some 400 years before the doctrine of the Trinity was well expressed by the Church, nevertheless, the work of God the Holy Spirit is not impotent.
The gift of Apostleship didn’t only occur after Paul, but it was a unique spiritual gift of the Church Age.
Christ mentions it prior to His Ascension.
The unique aspect of the Church Age is the indwelling of God the Holy Spirit in all believers. They also are indwelt by God the Son and God the Father.
What is the "gospel" that Paul calls "my gospel"? It is found in 1 Cor. 15:1,3,4.
Did Peter preach the good news that Christ died for our sins, was buried and resurrected on the third day on the day of Pentecost? NO. He was NOT preaching the good news of the Cross. He was preaching a message of restoration. For Jew and Gentile? no. For the nation Israel. The Cross is preached by Peter as SHAME for Israel, not good news. If people would just read Acts 2 and 3, they would find no mention of the Gospel of the Grace of God. Because it was not known until revealed to Paul. Paul is not saved until Acts 9, so the Church, the Body of Christ could NOT have begun before then. It's real simple if one would just read what God's Word ACTUALLY says instead of reading things into it that aren't there.
1Co 15:9
(9) For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God.
Paul persecuted the Church prior to His conversion.
The Church began before Paul, by his own statement.