gothic_black_rose
If you look up the peace sign you will find that it isn't satanic. Plus there isn't anything wrong with an upside down cross. After all Peter was crusified upside down meaning his cross was upside down.
Peter choosed to be crucified upside down because he thought he wasn't worthy because he denied Jesus the 3 times Jesus said he would after the last supper and after Jesus was betrayed by Judas in the garden. Technically, a cross upside down is considered satanism and dishonoring the truth that Jesus was crucified on the cross to forgive all sins.