Harry Potter's not occult. Have you read them? You remind me of the people who thought Dungeons and Dragons were going to get kids sacrificing to Satan.
I read the books first before letting my siblings read them. If they had held a trace of the occult - even a whiff - I'd have rather had a millstone hung about my neck than recommend them. There were some books I previewed for them that were evil, or occultish, or just had no redeeming values, like Philip Pullman's "His Dark Materials" trilogy.
But Harry Potter is set in a moral universe - just not ours. You've got to understand the difference between fiction and reality is that all fiction is about a world a lot like this one, with some crucial difference. In HP world, that difference is that magic works, and is not necessarily evil or forbidden. If you can't figure that out, well, then this conversation is pointless to continue.
My family is just the worst. The week of exams is my son's birthday, so he is planning on having his party be his first D&D game. When I asked my children what they wanted to do for the summer when we aren't doing schoolwork, they said they wanted to do Hogwarts Correspondence School again. This year I need to remind my 10 year not to practice potions class before mom wakes up. Wicked homeschoolers!