Just wanting some clear-cut answers on the following questions:

When a cleric casts, what exactly happens? Does he invoke his deity's name, or speak in some weird language? If the latter, what determines is another PC identifies which faith that cleric belongs to?

An example would be a cleric posing as another cleric, or a cleric telling someone he is a wizard, in public, as he casts.

A cleric does not necessarily invoke his deity when he casts.

A cleric -does- cast certain spells in a slightly different way than wizards (less spell components, for instance, generally more Foci), and a learned/experienced with magic character could probably pick up on this. Bobo the half-orc and Grug the Dwarf probably can't.

-Cross