The main altar was designed by Father Rene Gracida, later a bishop, and blessed on February 12, 1956. The two base blocks of Botticino marble weigh two and one-half tons each, while the cross-slab or mensa of dark green marble from the Swiss-Italian Alp quarries weighs ten tons. Dr. Leo Ravazzi, of the Pietrosanto Marble Studio in Italy executed the four sculptured panels of the base blocks.

They depict four sacrifices of the Old Testament: left front panel, Abraham and Isaac (Genesis 22); right front, Moses and the Paschal Lamb (Exodus 12). Pictured below are the left rear panel, Abel's Sacrifice (Genesis 4) and right rear panel, Sacrifice of Melchisedech (Genesis 4). The vaulting above the main altar rises to 68 feet.