The Harry Potter problem seems to be that children might mistake his magic and miracles for reality.  But Harry is presented as fiction and not endorsed as fact by trusted adults.  Religious magic, such as virgin births, angels, devils, heavenly rewards for terrorist martyrdom, and infallible popes ARE presented as fact by trusted adults.  There is heavy social pressure on children to pretend to believe.  Few adults are brave enough to tell the truth to children. Harry Potter books are a direct threat threat to religion because the book's magic stands on the same imaginary base as the religious magic.

One might hope that religion, true or false, would contribute to a peaceful world.  But when each sect claims to have the only truth and denies the rival sects, humanity is separated into warring camps.  History and current events prove this to be a major source of cruelty and hate.

When children are brain-washed into religious mysticism, their view or reality is distorted and their critical thinking impaired rendering them vulnerable to the manipulations of imams, priests and Pat Robertsons.