Tolkien and Lewis worked Christian parallels into their stories, making each one into a kind of Christian parable. This is different from what Rowling has done, which is to make out a quite private universe of good and evil with no particular connection to anything else other than to make people feel good. That kind of quest has been a pursuit of fallen mankind since Adam and Eve, and human nature keeps it from succeeding. Man needs a Savior not a bunch of feelgood stories.
According to the link in post 53, Rowling is a professed Christian and her books have Christian parallels.
But leaving that aside, it seems to me that you’re saying all writing should be Christian allegory or it’s invalid. I disagree. Human beings need entertainment and have been passing down stories purely for the sake of pleasure since the dawn of history.
Humanity needs a Savior, and humanity has one. With few exceptions in this era of mass communication, Jesus is available to all who seek Him. But not every book, every movie, every everything produced by a Christian need be about Jesus. Even Jesus turned water into wine and partied with sinners. Sometimes fun for fun’s sake is okay, too.