The other part still has some issues with the Christian paradigm, and would prefer something else.
Goetia is an art reverent to Jehovah, but Christianity is something found in other grimoires of a similar vein like Red Dragon and True Black Magic.
The Jehovah thing is the part of traditional Goetia that derailed most of the interested people known to me. They wanted diabolic demonolog and instead found prayers and the dire threats of Jehovah. The art is replete with Biblical references and sanctimonious purification rituals. The robes are white, the equipment is fancy, and the entire concept is far-fetched, but the promised rewards are very attractive so they desperately want some small part in it though they detest the style.
By the time the grimoires were written and popularized (17th to 19th century) it was no longer such a terrible thing to be suspected of sorcery throughout most of Europe and especially in Italy, France, and England from whence the grimoires arose. Generally the intelligent people were already drifting away from Catholicism, and Old Testament occultism was a way to venture beyond their weakening spirituality while not divorcing themselves from it entirely. In this respect I believe that occult historians like Waite and Summers are cruel and demeaning to the attitude of the sorcerer characterized by the grimoires, though Levi gives the past masters far too much credit spiritually and technically.
On the bright side, believing in Jehovah and attending his worship is irrelevant to most of the grimoires. They are, literally, pacts with demons in the classic medieval sense. This is not, except in the most recent grimoires, explicity described as such a pact, but in all the grimoires the magician and the spirit have a mutual binding. The magician does his part, the spirit does its part, both incurring some benefit and some inconvenience.
In making such an agreement the magician uses the names of his (or her) deities, powers, or whatever you hold sacred. The medieval grimoires are derived from Jewish lore, and the spirits are sworn by names relating to Old Testament events and people as they are important elements of Judaism. There are spirits bound by other oaths than those made in the name of Jehovah! If you can make the spirits serve you in the name of Bob, then such is your covenant.
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