Sacrilege
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Sacrilege is the violation or injurious treatment of a sacred object. In a less proper sense, any transgression against the virtue of religion would be a sacrilege. It can come in the form of irreverence to sacred persons, places, and things.
[edit] Catholic teaching
Many manuals on moral and sacramental theology likewise confirm that "Unworthy treatment of the Eucharist is the worst of sacrileges."[8] "They who make a sacrilegious Communion," writes St. Cyril, "receive Satan and Jesus Christ into their hearts — Satan, that they may let him rule, and Jesus Christ, that they may offer Him in sacrifice as a Victim to Satan."