You may stand corrected, but you haven't learned anything. Both of those suggestions are also inane.
Works of fiction are found in the literature section--Class 800--and would be made infinitely more difficult to navigate if the contents of the 'religion' Class were moved there. It would make the classification system poorer and less meaningful.
The religious section of the library contains not merely the religious texts themselves, but also anti-religious texts by atheists including Dawkins and Harris are found in this section. You can't just re-label the whole fucking section 'ancient mythological fiction'.
Luckily for the rest of us, we have competent librarians whose knuckles are clear of the floor, so your 'help' is not required.
There is no 'military' section. Libraries aren't arranged like a fucking Dymocks. 'Military' is split into many different categories, including military science, military law and military engineering, while military history texts are spread throughout these sections, plus the history sections. In addition, works such as Caesar's Commentarii can be found in the 870's, under Latin Literature. Religious texts don't belong in any of these sections.