What I think might help you:
Cathedrals are amazing structures of pure awesomeness towards some ideoligies. It has to be amazing and has to stand out. You might need a larger front entrance. Google 'cathedral' and you'll find the entrances the most. Those things are talll and enormous! Statues too. Also some glas in lead windows (although thats directly translated from dutch).
Need more decoration, tiles, patterns, candles, benches and an altar, gravestones, sarcophagus, artifacts, sin chambers, etc. If you do some research (I know this stuff from high school); churces are always made in a cross pattern
(http://www.alsbom.org/clientimages/3646 ... rint01.jpg
Also, I see you're building it with the 'goth' style build (somewhat) because of the support that is outside the building. In the late romanos they built insanely heavy and big churches with huge rocks to support the roof and walls and such. In the goth's style, they mostly build really high and with large windows. But all that weight has to go somewhere and something has to hold it. So they built arches (which are stronger than squares) and the outer supports which you have too. That means you either need larger windows or some fluff to stay away from realistic building (duhhh fantasy game, youdon't really need to be realistic
)http://www.undiscoveredscotland.co.uk/g ... lx-450.jpg
Also, more side-towers. It's not a castle, it's a large building. Also, some more actual supports inside the church (the cylinder things, forgot the english term), pilar?
One obvious tower sticking out in the middle.
Perhaps some inspiration from a legendary terrain maker:
Theomar Pius: http://www.coolminiornot.com/199915?browseid=377077
Both are amazing at terrain.. I can't believe how they built things.