In the early days of Christianity, the One God sent angels Harut and Marut to create a counterpart to the demon-inspired sorcerers in the Order of Haroth. That counterpart became the Guardians of Faith.
The Guardian organization embedded within the fledgling Catholic Church. Though Christians, the Guardians remained open to all faiths.
In their belief, the faces of god within the many monotheistic religions were all the same face, that of the One God. Because of this, there should be no strife between the religions.
Guardian members would ultimately branch out from the Catholic Church and enter other religions. They maintain a veil of secrecy in the use of their One God-given magic while dedicating themselves to stemming the dark tide as represented by the Order of Haroth and other supernatural threats.