A church is not a building. It is a body of people coming together in one accord to learn from each other and hold each other accountable to the faith they all share. Early churches used to meet in people's houses, and they would switch locations often to avoid being caught by the Romans, who would persecute them if their activity was known. The only place I know of where God's presence was in a specific building was the Holy of Holies in Solomon's temple in Jerusalem, and the temple rebuilt in its place under Nehemiah. This was because it was before Christ came to earth as our High Priest, so the people needed a priest to connect them to God. Now, believers have access to Christ through prayer, and can indeed pray anywhere and have access to the Heavenly Father. As I said, a church is for learning and encouragement, as well as coming together for corporate worship.
