Mercurius
Legend
The easy answer: not necessary, but useful.
I'm a bit proponent of the "build your own cosmology" approach, and am even considering making a guide for doing so. It really depends upon you and how you want to build your world; what gods are, and where divine/clerical power is derived from.
If you want to create a more contemporary vibe you could base it off of Jungian archetypes: the gods are energetic patterns within the collective unconscious, that can drawn upon for for power through training and--in the case of clerics--faith and adherence to said archetypes.
I'm a bit proponent of the "build your own cosmology" approach, and am even considering making a guide for doing so. It really depends upon you and how you want to build your world; what gods are, and where divine/clerical power is derived from.
If you want to create a more contemporary vibe you could base it off of Jungian archetypes: the gods are energetic patterns within the collective unconscious, that can drawn upon for for power through training and--in the case of clerics--faith and adherence to said archetypes.