Just doing a pop in, reading over all of this I did a quick set of google searches (not hard to do) I found a cleric archetype that lets them use arcane and a wizard Archetype to let it use divine, this only furthers the fact that the spells are from one mass source rather than just saying there is the great wall'o magic that divides arcane and Divine. I'm not that familiar with pathfinder but there isn't much separation in the two at all...
