I am currently fleshing out a species I created for my fantasy setting. Basically, they're an elven tribe that formed an alliance with wyverns. It sounds a bit cliché but every newborn child is attributed a draconian mount and they develop a bond, kinda like Eragon. Now I'm trying to figure out their spiritual beliefs and thought it would be interesting to add this: They strongly believe that when both the rider and its mount die, their souls unite and together they fly towards another plane. One witnessing this phenomenon would only see a winged humanoid slowly rising toward the sky. In other words, it'd be some form of explanation of angels. I'm merely writing a guide to this species (D&D-style) and that part might not even be mentioned in the novel. However, I'm afraid it would offend readers of Christian faith if I do, and that is certainly not my goal. Would you be offended? Should I completely avoid that kind of content?