My issue was that they left some things out and adjusted some other parts of the story to create more drama. So in a way, the result was character assassination of the main character because they didn't properly explain his motivations. It also ends with he and another main character -- who always stood behind him in the books -- breaking with him. Again, likely for dramatic impact, or perhaps virtue signaling.
But if you're interested in the story at all, I'd definitely see it. Great popcorn flick despite mucking up the story a bit.
The plot changes were mainly made to create a girlboss and denigrate religion.
In the end they massively undersold the main character in the story who was supposed to be somewhat godlike in his powers. Instead he became more of a milquetoast caught between a scheming mommy and girlboss girlfriend.