You can remove it locally if you go to your RWR folder (most likely in
C:\Steam\SteamApps\common\RunningWithRifles\ and then browse to
\media\packages\vanilla\items\You can open that file with any texteditor and see this line:
Code:
<carry_item file="base_valuable.carry_item" name="Holy Koran" key="koran.carry_item">
You can replace the name "Holy Koran" by whatever you want, just make sure you don't delete the quotation marks.
You can also replace the model and texture:
Code:
<model mesh_filename="bible.mesh" texture_filename="koran.png" />
For example by
Code:
<model mesh_filename="magazine.mesh" texture_filename="horny_magazine.png" />
or any other mesh's and textures that you want.
Analogous you can replace the HUD icon:
Code:
<hud_icon filename="hud_koran.png" />
to
Code:
<hud_icon filename="hud_horny_magazine.png" />
You can replace them by whatever mesh, icon and texture you want (you can find those in the vanilla-folders).