You seem to be suggesting that anything one enjoys is "entertainment." I enjoyed tax accounting when I was employed, but it wasn't entertainment. I enjoy cleaning the floors, if I can get all the kids out of the way for an hour, but it's not entertainment.
If you mean that Scripture, prayer, and worship aren't enjoyable, then that's pretty sad.
Enjoyable, yes. But, still a bit of work. Entertainment like Harry Potter is more of an escape. A relaxation. I can't explain exactly the difference, but there is.
What I mean is that you should do these things even if you don't particularly find them enjoyable, especially since the pleasure is, for most, an acquired taste rather than an instinctive one -- unlike fiction.