Binky, I know of lots of classical homeschoolers who do not use WTM. There ARE explicitly Christian classical resources. Here are my favorites:
Christine Miller, of All Through the Ages fame, has had a plan up that has influenced me since I began homeschooling:
http://www.classical-homeschooling.org/
The Bluedorn family has written a book, Teaching the Trivium, in which they claim the three “stages” are in fact the Biblical stages of knowledge, wisdom and understanding. I recommend this if you are interested in the subject. Again, it influenced me far more than WTM. Here is their site:
http://www.triviumpursuit.com/
You may also want to check into the writings of Andrew Kern, Tracy Lee Simmons, and Andrew Campbell. Specifically The Latin Centered Curriculum, Climbing Parnassus, and check out the CiRCE Institute. http://www.circeinstitute.org
Last but certainly not least, there is Martin Cothran at Memoria Press. He publishes the Classical Teacher which is part newsletter, part catalog. You haven’t really dipped your toes into Christian classical unless you’ve read him. He is specifically Christian in his understanding of classical education. http://www.memoriapress.com
The classical education world is actually a pretty big one; I haven’t even touched on specifically Catholic resources yet. I can dump those on you too if you are interested.
Michelle D