Not Christian myself, but their are depictions of non-Christian religions and/or magic as well in Mexico (the ride and the "country" itself is a Mayan temple, Japan has a Shinto shrine and China a Buddhist temple (IIRC), that some people may not be comfortable with. All these are well "out in the open" and really can't be avoided. The Kali river rapids is at least named for the Hindu Goddess of Distruction, and the Asia trail is filled with the "ruins" of Hindu temples.
Personally, I find other guests give me more to pause about than what Disney presents to young people (we are fairly liberal people). It isn't uncommon to see young teens walk around in short shorts with "sexy" across the back end (I understand Disney has decided this is inappropriate theme park wear, which is nice in my mind), belly shirts and hip huggers with their boyfriends hand in their back pocket. Nor have I ever been where I haven't heard someone use what I consider "inappropriate in front of small children" language (although I have convinced my own children that Mom yells "Shoot" when she drops something - I myself am not perfect). Disney is a popular destination for couples of all sexual orientations year round, some of whom the phrase "get a room" would apply to (if seeing a same sex couple holding hands will bother you, WDW is never a good choice, regardless of time of year). At the same time, we've seen very conservatively dressed guests that I assume are Amish or Mennonite, as well as conservative Jews and Muslims.
I, too, recommend a good guidebook (the Wiley one is an excellent suggestion) with detailed descriptions of each ride. Each person has an individual comfort level (whether because of Christian beliefs or for other reasons - I know non-Christians with more conservative ideas of what they will expose their kids to than some Christians). I know many Christians who I'd whole heartedly recommend Disney to, and others that are not going to find much that isn't offensive in some manner. The posting requirements you have set out make me believe you are the latter, and that you are not going to find your vacation enjoyable.