Question

Why the church is one, holy catholic and apostolic?

Answer 1

One: the Church is one. This means that it is a single, united and global Church which has its basis in Christ Jesus.
Holy: the Church is holy, because it is the Body of Christ with Jesus as the head. This does not mean that all members of the Church are sin free. It means that the Church and her sacraments help to make the faithful holy.
Catholic: the word catholic literally means ‘universal.’ The role of the Church is to spread the Word of God universally across the world.
Apostolic: the origins and beliefs of the Church started out with the apostles at Pentecost.

Answer 2

There is only one united church, whose teachings are based on the teachings of Jesus Christ. It is holy because Jesus Christ is at its head, it is Catholic because it is universal. It has a task to reach everyone. It is apostolic because it has based it beliefs on the works of apostles, the disciples of Jesus Christ.

Step-by-step explanation:

Catholic Church became an important element in Europe when Constantine The Great introduces Edict of Milan. Since then, the role of church grew stronger. During the Middle Ages it had the highest authority. Practically no one doubt the word of the Holy church.