Amazon Ad Categories... need help

I’m setting up Amazon Ads for my children’s devotional book. Is it just me, or are there ZERO categories for Christian children’s books? I know the categories exist on Amazon, but nothing is showing up in the Ads manager. Am I missing something? Has anyone else experienced this? I was able to find a “religion and spirituality / devotions” category. Which is very vague and not necessarily going to get my ad in front of Christians. But there was nothing in the children’s book category. (I’m specifically wanting to advertise my print book, not ebook).