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Yes, that is what we Christians in Christ's Church, the One Holy Apostolic Catholic Church believe -- that there is one mediator with the Father, Jesus Christ. "For there is one God and one mediator between God and men, a man, Jesus Christ, who has given himself as a ransom for all, the testimony in its own time" (1 Tim. 2:5-6)

The Catholic Church has always believed that Jesus Christ is the one mediator between God and man. It is the death and resurrection of Jesus alone by which people are saved.

In 449 Pope Leo the Great wrote his Tome against Eutyches, who taught that Jesus Christ had only one nature, not two. (This was the heresy of monophysitism.) In the Tome, which the Council of Chalcedon accepted as the authentic Catholic teaching on Christ, he quotes 1 Timothy 2:5 as the authentic Catholic doctrine: "Hence, as was suitable for the alleviation of our distress, one and the same mediator between God and men, himself man, Christ Jesus, was both mortal and immortal under different.aspects."

The fifth session of the Council of Trent (1546) laid out the belief in Jesus the one true mediator as the norm of Catholic faith: "[Original sin cannot be] taken away through the powers of human nature or through a remedy other than the merit of the one mediator, our Lord Jesus Christ, who reconciled us to God in his blood, having become our justice, and sanctification, and redemption."

The schema of the Dogmatic Constitution on the Principal Mysteries of the Faith, drafted for the First Vatican Council (1869-1870), includes the unique mediation of Jesus Christ as one of these principal mysteries: "Truly, therefore, Christ Jesus is mediator between God and man, one man dying for all; he made satisfaction to the divine justice for us, and he erased the handwriting that was against us. Despoiling principalities and powers, he brought us from our longstanding slavery into the freedom of sons."

These quotations from official Catholic documents give unambiguous proof that the Church believes Jesus Christ and no other is the one mediator between sinful humanity and the righteous God

Saints on earth and in heaven may intercede for others -- you may pray for me, as we are members of the Body of Christ. Because of this membership in Christ, under his headship, the intercession of the saints cannot be a rival to Christ's mediation; it is one with the mediation of Christ, to whom and in whom the saints form one body. Thus, we (men) ask them (men, too) to pray to the one Mediator (Jesus) in order to find favor with the Father.