I think you and I have a serious disagreement here. I think that a lot of what goes on in non-Christian religions is just nothingness. For example, idols aren't necessarily demons, they are simply stone, clay, and metal. Magic is empty words and stupid rituals that accomplishes nothing. I DO believe in demons, but I think most of non-christian religion is just so much balogne. It's like the story of Daniel and the idol Bel--Daniel proves through his brilliant detective work that Bel is not eating the sacrifices, but it is the wicked priests that are coming in through a secret door who eat the food at night: Bel is NOTHING but a fraud.
http://www.usccb.org/bible/daniel/14
But their idols are silver and gold, made by human hands. Psalm 115:4
The idols of the nations are silver and gold, made by human hands. Psalm 135:15