If my deity is true neutral can I be true neutral as well? Are the rules one off of the deity's alignment in play here? Also if I am true neutral now I essentially have access to all good and evil spells?
Technically, you always had the option of using all Good and Evil spells... it was just that there could be alignment/patron deity disapproval problems.
You still have to choose whether to Channel Positive or Negative energy. And that is a permanent decision.
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.