You know what? I HAVE STUDIED History for a year in University. Just to consider.
And I have studied the Holy Bible since I am 16 years old (8 years so far!)
That is wonderful.
And by studying the Holy Bible I found out that it must be like I said: The Ancient Christians WERE NOT CATHOLIC. For sure not!
Actually that is where you are very wrong. I will dump here a short timeline of the history of the Catholic Church from this website
davidmacd.com/catholic/timeline_of_catholic_church.htm
A Timeline of Catholic Church history
1-500 A.D.
AD Event 20s *c. 29 AD Our Lord’s Resurrection. The First Pentecost. St. Peter preaches in Jerusalem and converts three thousand people, creating the first Christian community.
30s *c. 35 Saul of Tarsus has an apparition of Jesus Christ and is converted to Christianity. *c.
39 St. Peter baptizes Cornelius. This event marks the beginning of the missionizing to the Gentiles.
40s *42 The first persecution of Christians in Jerusalem under Herod Agrippa. Many Christians escape to Antioch, establishing its first community.
*44 Martyrdom of St. James the Great, brother of the Apostle John. He is the first apostle to die for the faith. He was sentenced by Herod Agrippa in 44 AD. Today he is honored at the shrine of Santiago Compostela.
50s *c. 51 The Council of Jerusalem. It rules that Gentile converts do not have to observe the Moasaic Law.
60s *62 Martyrdom of St James the Less, Bishop of Jerusalem. He is stoned to death. *64 First persecution of the Christians by Nero, who blames them for setting a fire that burned much of Rome. Christianity soon after becomes a capital crime.
*66 Jews revolt against Roman authority. The Christians, remembering the prophecies of Christ, leave Jerusalem, led by their bishop, St. Simeon. A civil war ensues. Nero sends Vespasian and Titus to put down the insurrection.
*67 Martyrdom of St. Peter. Tradition states that he was crucified upside down. St. Linus succeeds him as pope (-76).
*69 Fall of Jerusalem. The Temple is destroyed. Tacitus records that 600 000 Jews were slaughtered during the siege; Josephus said it was a million.
70s *76 Pope St. Cletus (Anacletus) reigns(-88). 80s *c. 88 The reign of Pope St. Clement I (-97). During his pontificate, he issues a letter to the Corinthians, urging them to submit themselves to lawful religious authority. He writes “Our apostles also knew, through our Lord Jesus Christ, and there would be strife on account of the office of the episcopate. For this reason, therefore, inasmuch as they had obtained a perfect fore-knowledge of this, they appointed those [ministers] already mentioned, and afterwards gave instructions, that when these should fall asleep, other approved men should succeed them in their ministry.” 90s *95 Persecution of Christians in Rome under Domitian. *97 Pope St. Evaristus accedes to the Chair of Peter (-105).
100s *c. 100 Death of John, the last apostle. The period of Public Revelation comes to an end. *c.100 Birth of St. Justin Martyr (d. c. 165), Church Father. He wrote two Apologies of the Faith, and A Dialogue with Trypho, the Jew. In his writings, he bears witness to a number of Catholic doctrines. In one famous passage, he describes the Order of the Mass.
*c. 105 Death of Pope St. Evaristus. Pope St. Alexander I replaces him (-115).
you can read the rest at the site I gave above.