1. What if the Gods themselves don't agree on what is right and wrong? Mizahar's history pretty much proves that they DON'T. So that makes it kind of hard to turn to the Gods and assume they lay down black and white morals. There's over two dozen Gods, each with different ideals and morals and teachings. While some extremes might still be seen as black or white, there's sure to be tons of grey in between.
Take this example:
Rak'keli is surely a good Goddess. Her people heal and protect wherever they go. To quote her lore: "Her people are wholesome, honest, forthright warriors for the light. Tenacious, fierce, and dedicated..." Surely they are absolutely 'good'... Right?
But look at her Gnosis: "Her only demand in return for granting a gnosis mark is that the recipient swears anoath to never turn their back on the opportunity to heal that which is damaged. That healing must be offered freely to both friend and enemy alike. It is a serious oath and one that, if broken, can result in a gnosis mark turning negative or the loss of the mark completely..."
So what happens if a Syliran Knight, Holy and Good servant of Tyveth, strikes down a vile, evil mass murderer... And a follower if Rak'keli steps up to heal the evil person from the brink of death. Is the healer doing 'evil' by helping save a corrupt and vile person, or doing 'good' by saving a life because all life is precious? You can't ask the Gods because one will say one thing and the other the opposite. So where's your 'black and white' morality then?
2. Society interprets the Gods' wills differently. Rhysol is flat out evil, right? But here's a quote from Ravok's lore:
She guided them to grow and flourish and under the protection of The Black Sun. The people came to love Rhysol. To inhabitants of Ravok, Rhysol is their protector...
This is reinforced by the roleplay in Ravok, where people love Rhysol and are devoted to him and his glory. He protects them, keeps the water clean and the food growing, etc etc. Ask someone from Ravok if their God is evil and they'll call you a blasphemer for besmirching their beloved father's name.
There's lots of possible views here. Lots of ways these things can be interpreted. But I don't think Mizahar can be said to have an 'absolute morality' just because morals are handed down by the Gods.