The Catholic faith centers itself on the belief in one triune God who created the human race, revealed Himself to it and who calls all people to eternal life with Himself. The sources of the Catholic faith are the Bible and Sacred Tradition, of which the magisterium is chief interpreter.
The Catholic faith holds that God is a trinity, that is, that there are three persons, yet only one God. These persons are distinct, a yet are not separate gods nor parts of God. Each is God entire and full, and the three persons are co-equal in eternity, knowledge and power.
Another foundational element of the teaching of the Church is that the second person of the Trinity, Jesus Christ, became a human being to expiate the sins of the human race. Though Jesus took on human flesh, he still remained fully God. According to the Catholic Church, Jesus was not part man and part God, but remained the second divine person of the Trinity even while taking human nature upon himself. After his death on the cross, the Catholic faith holds that Jesus rose from the dead and ascended into heaven.
Catholics believe that Jesus was the fulfillment of God's revelation, and that he established his Church to pass this revelation and his saving power through history, particularly through the Bible, the mass and sacraments and the magisterium, or teaching office, of the Church.