Space does not permit the extensive answer this question deserves, so I recommend that readers obtain a copy of Karl Keating's book Catholicism and Fundamentalism, in which Mr. Keating devotes an entire chapter to this question. Still, I'll attempt an adequate defense of the Church's teaching on the subject of infant baptism.

No. That the Sacrament of Penance was instituted by Christ can be proven in the Bible.

We believe in the Real Presence of Jesus Christ in the Holy Eucharist because He promised to give us His Flesh as food and His Blood as drink. In order to see this we must turn to the sixth chapter of St. John's Gospel.