RE: Mixing faiths:
Some might have a bit of truth, but then again, the Devil comes as an Angel of Light. IMHO, if you call yourself Orthodox, yet you mix aspect of other faiths, you're not Orthodox, and you should be very careful. Then again my opinions and a quarter will buy you a cup of coffee.....
RE: Roman Catholic prayers and WR:
Yeah, we use some of them, but they are modified to remove heresies.