I've heard it said that the greatest deception that Satan perpetrates on humanity, is convincing it that he does not exist.
I think God's greatest Truth, and perhaps His greatest challenge, is convincing us that He DOES exist, in the Eucharist.
A Fox News poll reported in 2004 that 71% of Americans believe in "the devil." I guess that's not so bad considering Satan and his demons work tirelessly against us. Of course, belief in the devil's existence doesn't necessarily translate to belief in what he's all about. I suspect a lot of these folks picture the devil as a hapless Elmer Fudd in a red little-devil suit with a rubber pitchfork and fake horns, rather than a fallen archangel who hates God and whose ultimate goal is to turn us against Him.
Now for the not-so-good news. The Center for Applied Research in the Apostolate, at Georgetown University, reports that only 57% of Catholics believe in the Real Presence. And since only 24% of Americans are Catholic, I suppose that works out to only about 14% of Americans believe in the Real Presence. Ouch.
Ironically, Satan desperately would like us to forget both him and God; and God both desires fervently that we believe and turn to him through the Source and Summit of our faith, and that we recognize the danger of the devil in our lives.
Kneeling during Mass, we recite the words that profoundly express this faith: "Lord, I am not worthy to receive you, but ONLY SAY THE WORD and I shall be healed."