A most difficult thing to do.

Catholics believe that Jesus is really present in the Holy Eucharist, that the sacrifice of Calvary is repeated at every Mass, and that Jesus gives Himself to us in Holy Communion as food unto eternal life. We hear the words of the institution of the Holy Eucharist as said and done by Jesus. The priest in persona Christi and the consecration of the host at every Mass is an unbroken connection to the events of that Passover 2007 years ago: "Before He was given up to death, a death He freely accepted, He took the bread and gave You thanks. He broke the bread and gave it to His disciples and said: Take this all of you and eat it, This is My body which will be given up for you." (Mark 14:22-24; Matt 26:26-28; Luke 22:19-20; 1 Cor 11:23-25)

The Doctrine of Transubstantiation, the Real Presence of Jesus Christ in the Eucharist, is held by Catholics as a mystery of faith which far exceeds the capacity of reason or logic. That being the case, this sacred dogma of the Catholic Faith is held with reverence and solemnity.

I ramble yet, words fail me. As a practising Catholic, theologian and apologist, one draws from a personal storm jar.

http://www.catholicleague.org/release.php?id=1465

http://scienceblogs.com/pharyngula/2008/07/the_great_desecration.php