I think some of y’all are missing the point of the question.
Since every cleric gets Turn Undead, I think a religion built around the cleric would have to hold that undead are bad. However, there are multiple resurrection spells on the cleric spell list, so returning from the dead isn’t necessarily against this religion’s precepts. That suggests it may be more about how the body is meant to be treated than anything about the natural cycle of life and death. They are opposed to magically animating corpses, not to living beyond your divinely-appointed time.
Clerics also have Domains, and each cleric dedicates themselves to one Divine Domain to the exclusion of all others. This might suggest that clerics are supposed to specialize in the cult of one particular deity among a pantheon, or, if you want this religion to be monotheistic, to the study and veneration of a particular aspect of the Divine’s creation. Offensive spells and armor proficiencies suggest that clerics serve in a military capacity to some degree, perhaps as crusaders for the faith. This to me indicates some central authority or institutional hierarchy, so I would lean more towards the latter.
The cleric’s spell list is heavy on divination, which suggests a belief in predestination, but no particular precept against predicting the course of destiny. Perhaps part of the clerics’ role is interpreting the will of the Divine. Lots of radiant damage suggests an association of light with the Divine’s power.