I believe the exact opposite. Spirital Affairs is something that can be pushed back to the longer term, Communication is something that is more relevant right now.
Specifically, Communication and Finance are both incredibly relevant for the negotiations with the Ha-Yith-Kai. (ie. setting up long-term communication with them, and sorting out taxes / tribute)
If the ES and Ha-Yith-Kai can start coordinating well from the very beginning, then that's going to great immensly in the upcoming war. Not just in being able to understand and hence fight the other Ith better, but also in better knowing how to sue for peace with them.
Works and Spiritual Affairs is the simple choice with how it affects our hamlet building right now. But the opportunity to plan our city better isn't going to go away.
On the other hand, we may or may not have another chance to negotiate between the Ha-Yith-Kai again. Maybe we will if things go well, but there's also the chance of things falling out of our hands.
In summary, our relationship with the orthadox spiritual affairs can be fixed later, but we may only have one chance at shaping the relationship between ES and the Ha-Yith-Kai, getting our foot in the door earlier with the relevent people will be helpful.