Prove that the teaching of the Church is 2,000 years old.
Even Catholic Bible version do not teach plainly what the Church is teaching. You are not going to find Eucharist or the Mass in a Catholic Bible Version or any Bible version. So where did the Church get that which you claim was 2000 years old? Nowhere. They made up Catholicism as time went by.
Look at this Catholic web site depicting the history in the development of the Catholic church and the doctrines within.
A Timeline of Catholic Church History: 1 - 500 A.D.
"*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." "
In that same letter, Clement sent men to collect from the church a portion from the bounty. That was why he was accusing the church at Corinth of jealousy because they were not giving any portion to a church at Rome just for the sake of respecting those in authority over them. The Catholic church today still expect each local Catholic church to give something to the hierarchy.
Then there is this vague reference ;
"*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."
But Ignatius was the first one to use the term Catholic.
"*c. 107-117 Martyrdom of St. Ignatius of Antioch, apostolic Father and bishop. He was a disciple of St. John, along with St. Polycarp. Theodoret, the Church historian says he was consecrated bishop by St. Peter, who was at first bishop of Antioch before going to Rome. Ignatius was martyred in Rome under Emperor Trajan's rule. It was during the journey to Rome that he wrote his famous letters that contain invaluble information about the early Church. He was the first to use the term "Catholic" to describe the Church."
Then we find this.
"*c. 305 The Council of Elvira, Spain approves the first canon imposing clerical celibacy."
It wasn't an apostle teaching to impose celibacy on priests.
So sometime along the way, Catholic priests are not allowed to marry when it is required for them to be celibate to perform the Mass. If they get married, they can only do communion. If you do not know this; then ask someone in Catholic authority for confirmation or clarification.
But false teachers had existed in the days of the apostles and when one deviates or teach something untaught by the apostles, you should suspect it as coming from false teachers.