The church in the book of Acts is shown as a spiritual entity. At their best, the Christians in Acts were indwelt, empowered, and guided by the Holy Spirit.
Acts has much divine activity. God was breaking in on people of various cultures and backgrounds. Luke was especially concerned that his readers understand this.
The Acts of the Apostles is unique. It is the only God-inspired history of the early church. Acts tells the story of the church's progress. It also reports failure, dissension, and error.