Why was the Catholic church built?

The Catholic Church was not built, so much as born. The Catholic Church is the Mystical Body of Christ (read St. Paul), it was born from His side, when He was pierced by a lance, as He hung dead on the cross and out flowed blood and water - symbolizing the Eucharist and Baptism. Later it was shown to the world at Pentecost. The Catholic Church is Jesus Christ present in the world, saving His people. The "Catholic" part simple means that while remaining one throughout the world, it is the universal means of salvation for all people, outside of which there is no salvation. "Outside the Church there is no salvation" (Extra ecclesiam nulla salus).
The Catholic Church was not built, so much as born. The Catholic Church is the Mystical Body of Christ (read St. Paul), it was born from His side, when He was pierced by a lance, as He hung dead on the cross and out flowed blood and water - symbolizing the Eucharist and Baptism. Later it was shown to the world at Pentecost. The Catholic Church is Jesus Christ present in the world, saving His people. The "Catholic" part simple means that while remaining one throughout the world, it is the universal means of salvation for all people, outside of which there is no salvation. "Outside the Church there is no salvation" (Extra ecclesiam nulla salus).