Sacrilege (4)
(n.) disrespect to something regarded as sacred
Sentences
An act of sacrilege would be burning the American flag, because it is a symbol of he United States of America.
Some people would consider dozing off during church and act of sacrilege.
Synonyms
desecration, profanity, blasphemy, disrespect
Antonyms
piety, praise, respect, reverence