Yes it's an amazing book in many ways, but compare reading the book of numbers to let's say a Lee Child 'Jack Reacher' story (which is already too much for a lot of people), and I'd easily call the Bible a pita to read. There's also lots of ancient references, it's long, the narrative changes, lots of fairly cryptic stuff etc. And worst of all, much is open to interpretation, which some people who hear the odd verse take as a 'this can mean whatever I want because I haven't read any of the context or tried to understand the opinion of the author(s?)'