Perhaps read the catechism of the Catholic Church , rather then stating non facts
http://www.vatican.va/archive/ccc_css/archive/catechism/p1s2c2.htm
423 We believe and confess that Jesus of Nazareth, born a Jew of a daughter of Israel at Bethlehem at the time of King Herod the Great and the emperor Caesar Augustus, a carpenter by trade, who died crucified in Jerusalem under the procurator Pontius Pilate during the reign of the emperor Tiberius, is the eternal Son of God made man. He ‘came from God’,4 ‘descended from heaven’,5 and ‘came in the flesh’.6 For 'the Word became flesh and dwelt among us, full of grace and truth; we have beheld his glory, glory as of the only Son from the Father. . . And from his fullness have we all received, grace upon grace.'7
Please note
Jesus of Nazareth, born a Jew of a daughter of Israel
We Catholics believe and confess this.
And in the first article we see Jesus was born under the law
422 'But when the time had fully come, God sent forth his Son, born of a woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons.'1 This is ‘the gospel of Jesus Christ, the Son of God’:'2 God has visited his people. He has fulfilled the promise he made to Abraham and his descendants. He acted far beyond all expectation - he has sent his own ‘beloved Son’.3
Under the law means under Jewish law, God’s law. Not the law of Caesar.
Jesus was born ethnically culturally and racially Jewish. And did not get rid of Jewish law but fulfilled it.
Jesus message was universal, all embracing. Catholic means universal and all embracing. So in those terms yes, Jesus was introducing Catholicism to us.
However , Jesus was Jewish and born under the law, tried under Jewish law for blasphemy and other law breaking activities by Jewish authority. They had been after Jesus to kill Him since He began His Ministry. Rome couldn’t have cared less about Jews breaking Jewish law.