I'm on my third reading. First time reading aloud to my older son, then aged five - he loved it. Second time just for myself. Enjoyable, but more fun to read it aloud. This time, reading to my younger son aged 6. He is loving it too.
I have been able to explain a lot of wacko real life religious beliefs while reading about the wacko fictional religious beliefs in the books. Bonus!
And seriously (not directed at you) if religious people feel threatened by books such as these, then their religion is not worth their wasted effort believing in it.