In my game was going to introduce a lawful evil cleric of Haelyn as a villain who would be working within the church. I was wondering how Divine spells work for an evil cleric of a good god. Is the cleric still positively aligned because his god is good? or negatively aligned because of his ailment? I was also wondering if anyone had though about why would Haelyn let an evil individual has access to his power?

My idea is that clerics in birthright get the ability to cast divine spells by going through rituals each church has, Like a priest being ordained. In this way humans induct people into faith and decide who has the ability to divine power instead of the gods choosing themselves. I think this explains why there are so many different interpretations of each faith when a god could easily end the debate by making thier will know.