Since you're true neutral and your god is as well. You should have access to (and can cast) all the alignment spells, since neutral isn't opposed by the other alignments.
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.
Just be careful what you cast. Holy Word for example, doesn't make the caster immune to its effects and so you risk deafening yourself every time you cast it.
Supposedly, casting spells with the [evil] descriptor (like curse water) slowly steers your alignment toward evil. Make sure to pet a kitten or something every now and then.