Casting spells won't change your alignment by itself. Though what you do with those spells might.
For a neutral cleric worshipping a neutral god, casting good or evil spells is not against their alignment or against their god (in general, animate dead would still make Pharasma frown). However, if you consistently cast evil spells or start raising an undead army as a cleric of Abadar or something like that, it could be well within the GMs judgement to have you shift to evil. Vice versa holds for good spells as well.
But this should mostly be handled with a conversation with the GM and roleplaying, not looking at the rules text.
That is absolutely not ok for a cleric of Sarenrae.
Chaotic, Evil, Good, and Lawful Spells: A cleric can't cast spells of an alignment opposed to her own or her deity's (if she has one). Spells associated with particular alignments are indicated by the chaotic, evil, good, and lawful descriptors in their spell descriptions.
Your deity's alignment matters just as much as your own. Since Sarenrae is good, you are not allowed to cast any spell with the evil descriptor. Period. Your god will literally not allow you to cast it.
That is absolutely not ok for a cleric of Sarenrae.
Chaotic, Evil, Good, and Lawful Spells: A cleric can't cast spells of an alignment opposed to her own or her deity's (if she has one). Spells associated with particular alignments are indicated by the chaotic, evil, good, and lawful descriptors in their spell descriptions.Your deity's alignment matters just as much as your own. Since Sarenrae is good, you are not allowed to cast any spell with the evil descriptor. Period. Your god will literally not allow you to cast it.
As a GM, I wouldn't even allow you to know of the spell's existence if you weren't drow.
You're good isn't neutral on the good evil axis. It's neutral on the law chaos axis.
You can cast chaotic spells, but you can't cast evil spells. Sarenrae wont allow it. She literally wont give you the spell, and that's where you derive your power as a cleric. It doesn't matter if your alignment is neutral neutral instead of neutral good.
Chaotic, Evil, Good, and Lawful Spells: A cleric can't cast spells of an alignment opposed to her own or her deity's (if she has one). Spells associated with particular alignments are indicated by the chaotic, evil, good, and lawful descriptors in their spell descriptions.
You're good isn't neutral on the good evil axis. It's neutral on the law chaos axis.
This is one of those areas where I wish Gygax had originally used a different term, like Balanced, instead of Neutral. So, we could have a spectrum defined as "Good-Neutral-Evil" and "Law-Balanced-Chaos" -- or something like that. Rather than "Good-Netural-Evil" and "Law-Neutral-Chaos".
The alignment system has been talked about and hashed over for decades, so I am NOT trying to reopen that discussion. Rather the semantics of using the same term in multiple ways. Bad enough that we use Level so many times; at least there we use it in different ways when applied to different things. With alignment, the confusion comes from using the same term for different things with the same reference scope.
Ok. Thanks for letting me vent on that pet peeve. I'll put away my soap box now.
I wish there weren't a law-chaos axis at all. It's far too vague to be useful, and rarely seems to inform a character's actions. It's more of something that gets thrown on because your class requires it. I'm looking at you, monk.