I am running a campaign where all the players originates from Earth. Apart from two believers in the old Norse gods, they are all devout Christians. One problem with that is that there is absolutely no information in the Planescape books about the God of the Worlds largest religion, or any of it´s abrahamic cousins.
At the beginning the lack of contact with their God after they entered the Outer Planes made for a lot of fun as the Christian characters got both frustrated, doubtful and somewhat humiliated. Before leaving Earth the Christian characters were adamant in their belief that theirs was the only deity in existence (they are members of a secret order descendent of the Knights Templar). The pagan characters are previous members of a governmental paranormal agency in imperial Germany that was trying to tap into divine energies for their own purposes. Mainly Christian, but one agent had the idea of giving the Norse gods a shot. When he died (in battle) he arrived in Valhalla and was sent back to Earth with the somewhat daunting task of reclaiming Northern Europe for the asatru.
He ended up as a captive of the Christians who, even when he demonstrated his new abilities, refused to believe he was sent by the Allfather. Instead they thought he had been decieved by some demon claiming to be the Norse god in question. Now that they have arrived in Sigil, and for example met a valkyrie, they have finally accepted that there are other gods, but I´m now faced with the challenge of fleshing out the Christian god, and figuring out what place He has in the multiverse. So far I´ve portrayed Him as an illusive and secretive god that some planars fear almost as much as Asmodeus (it is claimed by some that He is amassing an enormous army with the aim of conquering the entire Multiverse).The only way of entering His realm is by dying and transmigrating there.
Any other ideas?
There is also another issue I have to deal with. What about Satan? The Christian characters believe they are soldiers fighting against this dark adversery of their god. Should Satan be another prince of Baator? Asmodeus himself in another shape? Or the deposed leader of Hell?
I have had another idea that I would like some feedback on. What about creating a Christian pantheon consisting of two gods? Mainly the Father of the Christian Trinity (I haven´t sorted out what to do with Christ or The Holy Ghost yet, but I´m open for ideas) as well as the Jewish and Muslim God, but with Satan or Iblis as a divine adversary? It would perhaps be more in line with the Zurvanistic heresy of the Zoroastrian faith than these three religions, but at least there is a much stronger element of this kind of dualism in the Christian faith than in Judaism and Islam where Lucifer or Iblis/Shaytan is either given little thought or no autonomy whatsoever.
The good thing with imagining Satan as a deity is that I wouldn´t have to mess with the hierarchy of Baator as it is presented in the Planescape books. Satan would be just another deity residing in Baator with followers on certain planets on the Prime. He would also be able to give his worshipers full access to spells.
What do you think?