Harry Potter teaches Judeo-Christian values, not simply Christian values.
The book teaches children about the importance of being virtuous, moral, principled, and loyal, as well as the importance of standing for what’s right in the face of evil, tyranny, and persecution. These are human values, not Christian values, ones that don’t require the characters to wear a yarmulke to understand how they can apply to one’s own life.
The author makes sure not to mention of any specific religion, and the magic theme is supernatural as opposed to being based in religion (if anyone had concerns of kishuv).
I’m sure you can look for Christian themes and parallels in the books if you are trying to find a reason to ban it from your home, otherwise, your kids will enjoy a fun read about a the adventures of a modest boy and his friends who face and overcome challenges and adversaries together by sticking to their principles and always trying to do what is right, instead of what is easy.
HH