The only Christian Epic Metal that I know of is Theocracy. Only one album that I know of self titled. Sounds very much like Rhapsody (of Fire).
I too enjoy the epic metal. To explain it would be long songs that tell a tale like listening to a song version of "The Lord of the Rings". They use a lot of different instaments, similar sounding to the Metallica album that used the orchestra. Also uses a lot of synthesizers.
Your thinking of what is called "power metal" or.... i think it could be labled as Classical Metal. And O YEAH.... there is. I have to cross with my brother to see what he mentions (since he basically knows... ALL music). It is hard searching for that kinda music considering it is labled as SO many different things.