Blundermore

I mean... technically Islam has been in the server since the near beginning of the server, or borrowed heavily from.

Iblees for example is a direct reference to Iblīs, or the Devil if translated. Whom mingled with Angels (Anguels in our lore) Up until the point he defied the word of God to Bow before Adam. At which point God cast Iblees/Iblīs/The Devil down into Hell where he would rule for Eternity. 

Iblees similarly was not content with the idea that the Anguels and Daemons must give up their rights in order to become merely servant to the races and the cosmic workings of the universe. Choosing to walk among the Mortals instead corrupting them to his command until finally Krug turned around and told him he wasn't interested. At which point Iblees revealed his true form, enraged he conducted the 30 year Mythic war of the First Era resulting in God himself coming down with an Army of Angeuls and Daemons and cast Iblees down into the Nether where he would rule for all eternity. 

Sounds familiar doesn't it? When compared to Islamic and Christian Theology (which bare remarkable resemblance, but makes sense given they were conceived in the same region almost).

It's alright to borrow from real world religions, so long as you treat the source material with respect for what it is regardless of your personal beliefs.