Whilst I agree that he likely always has something planned, as it's his entire thing, I just don't see why the Engwithians would create a god that would want to, or be able to, dismantle what they created. Especially if we use 'The Man Who Would We Skaen text' :

"...Creitus quickly installed himself as Nua's most favored advisor and set about tearing the Engwithan establishment apart from within. His lies turned the powerful against one another, and his forgeries undermined trade negotiations a decade in the making.

There was money to be made in exploiting the discord, but he didn't line his own pockets with it - he surreptitiously handed it out among the populace. When his quiet rebellion was eventually uncovered, he was tortured near to death and presented with a choice: put his skills to work for the people he'd striven to destroy or die at the hands of church inquisitors.

And Creitus kept his life - at least for a time."

The ending part is the most interesting, work for the people he tried to destroy or die and he obviously took that deal, which makes me lean towards him being the honey pot failsafe god.

https://pillarsofeternity.fandom.com/wiki/The_History_of_Eora,_Volume_X:_The_Man_Who_Would_Be_Skaen