What happens when an Animate Dead reanimates a dormant god?
Yes, you do still sacrifice Karametra. Magic cards frequently use words like "the creature" to refer to a previously defined object, but it doesn't actually have to meet the criteria of those words. CR 608.2i spells this out explicitly:


  If an ability’s effect refers to a specific untargeted object that has been previously referred to by that ability’s cost or trigger condition, it still affects that object even if the object has changed characteristics.
  Example: Wall of Tears says “Whenever Wall of Tears blocks a creature, return that creature to its owner’s hand at end of combat.” If Wall of Tears blocks a creature, then that creature ceases to be a creature before the triggered ability resolves, the permanent will still be returned to its owner’s hand.