Sign of the cross? Why is it and upside down cross?

An upside-down Latin cross, based on a tradition that holds that Saint Peter was martyred by being crucified upside-down. Today it is often associated with anti-Christian or Satanic groups. It has also often become associated with Satanic and anti-religious attitudes, as it is considered to represent the opposite of Christianity by inverting its primary symbol, the Latin Cross.

(Interestingly, Jesus referred to Peter as "Satan", when he said to him "Get behind me, Satan!", in Mark 8:33; see also vade retro satana). As a result, this symbol has become very popular within anti-religion groups and among some extreme metal musicians, notably black metal and death metal ones. In popular culture, including films such as Rosemary's Baby, The Exorcism of Emily Rose and The Omen, Petrine Crosses are often displayed to represent Satan.

In Roman Catholicism the Petrine Cross is not seen as Satanic in any way. However, an inverted crucifix (a Latin cross with an artistic depiction of the crucified body of Christ upon it) is seen as immensely disrespectful, and could be used to represent Satanic forces. The distinction between a Cross of Peter and upturned Crucifix is sometimes obscured, leading to confusion about the acceptability of each symbol.

This was seen when controversy arose over the aforementioned Papal visit to Israel; pictures of the Pope sitting before a Petrine Cross were widely circulated on the Internet in an attempt to prove that the Catholic Church is associated with Satanism and the Antichris.

Upside down cross is a satanic symbol and is suppost to mean mocking Jesus or something like that its suppost to be evil.

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