Right first off I won't deny metal can be satanic, sme types of metal can be quite extreme and there is certainly satanic material out there if you want to look for it however... but those 2 example you gave are certainly not satanic and their members not satanists and neither are 99.99% of bands or fans. Metal is an art form and even the bands that sing songs that could be considered satanic are doing it mostly for effect. Do your parents think Pirates of the Carribean to be satanic for example, because that would be just as stupid to describe as such
What are your parents reasons for thinking Iron Maiden are satanic I wonder? Metal can talk about pretty much anything ranging from political issues such as http://www.youtube.com/watch?v=Ap14NKh6J8g&feature=related and fantasy stories by bands like http://www.youtube.com/watch?v=hF6MclyGOfw&feature=related and to make things clear Blackie Lawless from http://www.youtube.com/watch?v=KnlZ7XK_uVE&feature=related is just one example of someone who is a member of a metal band and also a christian so
