Superstitions and magic

I wonder if we're ignoring a part of existence because of our scientific understandings and our cultural reliance on the "logical" and "observable". All religions have ghosts. Some even demons. Those cultures that retain their superstitions as they become Christian... are they the purer? By combining the Truth with their lives?

What if demons can't stand the sign of the cross, even when made by fingers? What if witches do have power over us if they attain our DNA? What if the veil between the living and the dead is thinner than we thought? Why does voodoo work? Is it wrong to acknowledge the power of evil? Is it wrong to ignore the power of good? What if there is more truth in some superstitions than we realize? What if prayer is sometimes not enough?