Hawatari is sitting on over 4100 karma herself; the Wyrm has roughly 7500. They've been played regularly since the beginning too.
This said, a few things should be remembered/realized: while many religions have what they might describe as a 'codified' magical system, it can vary from sect to sect. Christians may see things generally the same, but if you talk to your GM, you can reskin whatever it is you want into some version of Christianity - whether that's Lutheranism, Mormonism, Baptist, or whatever, or even a particular order within the Catholic Church - because the Dogs of God (Dominicans) don't see things the same way that those of the Society of Jesus (Jesuits) do, or the Franciscians, or the Xaverians, etc. Just because the game designers set up the 'magical Way of Shintoism' a certain way doesn't mean your Shinto priestess needs to view things that way; there is sufficient variation in every religion to be able to alter the framework and find a sect or viewpoint of that religion so that your magic matches your religion.
Note that Catholics can use magic, but summoning is officially restricted to the general clergy, not just the Sylvestrines - not that people who CAN summon would refrain from doing so, any more than people who CAN have sex outside of the bonds of holy matrimony do so; it all depends on the person's level of devotion.
In regards to the teleport / back from the dead, Senko, please make sure you fill in all your facts. Any mentioned 'teleport' has been sufficiently explained by high-Force Levitation + other added movement stuff. Any mentioned coming back from the dead, religious (i.e. Ibn Eisa) or not, was clarified as having been a malevolent spirit (shedim) possessing and reconstructing the corpse. And killing (we could only wish) Brightlight was what the character deserved, for having been a Carl Sargent / Marc Gascione creation. I dearly wish their writing could be entirely excised from the world of Shadowrun, because it is hands down the worst crap I have ever read for a game.