It is true that the church is the body of Christ all the time. But it does matter whether the church is assembled or dispersed. There are certain things that can only be done when the church is assembled—like taking the Lord’s supper. In Acts 20:7, that is why they came together, to take the Lord’s supper. The church was also to take up a collection on the 1st day of the week 1 Cor. 16:2. It was an order for all of the churches, everywhere, according to Paul (1 Cor. 4:17) and 1 Cor. 16:1-2. When they came together in an assembly, they were to exercise church discipline, by withdrawing from wayward members who won’t repent. See 1 Cor 5:4-5, and 2 Thess3:6. Paul persecuted the church of God, this is spoken of in several places, 1 Cor. 15:9, Gal, 1:13, and Phil. 3:5 but in Acts 9, it says he was persecuting the church when he entered private houses, dragging out men and women and putting them in prison. So here, he is talking about the church as it is dispersed in the world. I’m only trying to make the point that God makes a distinction of times when the church is assembled in a church service and dispersed in society and their private homes. He recognizes both, the universal church of Christ and individual congregations like the church at Corinth, and the individual congregations mentioned in the first 3 chapters of Revelation; God recognizes the church when it is assembled together Acts 20:7 and when it is dispersed in private homes, Acts 8:3.