I am not affiliated with any, don't make money off them, or have anything to do with these but offer for you try if you like.
The following are Free Operating Systems and can be downloaded as "Live CDs" so you can try them before installing them:
Christian?
Ubuntu Christian Edition
Among its features:
GnomeSword Bible - with many language packs and Bible versions available
BibleTime - Bible study software
Dansguardian - Web controls for parents
BibleMemorizer - Bible study or rewrite the Bible to suit your tastes!
Virtual Rosary - (Uses WINE; not the drink, the Wine Is Not an Emulator app for MSWindows apps on Linux) - Get your rosary on your machine
Muslim?
Ubuntu Muslim Edition
And guess which version I use?Ubuntu ME wrote: Ubuntu Muslim Edition is a set of packages that customizes the Ubuntu distro by installing islamic software (prayer times, Quran study tool, web content filtering tool etc.) and by changing its design.
Ubuntu Satanic Edition
This is a great version if you like a dark themed desktop and don't mind risking your eternal soul to achieve such.