An indignity offered to God in words, writing, or signs; impiously irreverent words or signs addressed to, or used in reference to, God; speaking evil of God; also, the act of claiming the attributes or prerogatives of deity.
Speaking rudely to/about the IPU (see Invisible Pink Unicorn). Offensive language used against a god, made acceptable when Jesus did it (see Matthew 26:65). A "crime" committed by one who insults or shows disrespect to an omnipotent deity who nevertheless requires a human law to protect Him or Her from hurt feelings. Curiously, like the tree falling in the forest, it appears that blasphemy can only occur when a religious zealot is present to hear it. Nevertheless, blasphemy remains a criminal offence in the United Kingdom (last prosecution late 1970s - but fundy groups constantly threaten new ones) and in many Islamic countries, where such offences can incur the death penalty, and where questioning even the tiniest aspect of Islam is considered blasphemous.