A friend of mine was telling me while I was over playing board games with him at his house that the previous owner of the house was a witch. He said that while remodeling he's found pentagrams and such above doorways, etc. My friend doesn't believe in God and this doesn't appear to bother him. And right now he's not open (at least to me) in anything that regards God -- in fact he likes to mock people who believe in God.
What I'm wondering is whether I should "do" anything? Leave blessed salt in a corner? Other ideas?