Quote Originally Posted by erikun View Post
Why is everyone assuming this is how it works?

"A cleric who is neither good nor evil and whose deity is neither good nor evil can convert spells to either cure spells or inflict spells (player’s choice). Once the player makes this choice, it cannot be reversed. This choice also determines whether the cleric turns or commands undead."
(Spontaneous Casting for the Cleric)

You make the choice at character creation. It sticks with you for as long as you have class features. A spontaneous-healing (and turn undead) Cleric that turns evil still spontaneously heals and turns undead.
No. That rule (you choose one and stick with it) is talking about the choice between positive and negative that a neutral cleric gets to make. If you are no longer a neutral cleric, the rule no longer applies, because it is a rule for neutral clerics and you are not a neutral cleric any longer.