I don't like that you raise Temples, and when their function is gone, you raze them and build them somewhere else.

That seems very illogical. Temples when built don't get destroyed when they lose their function.

But in this Universe you do, that seems odd. Why would Nakalim remove their Temple?

Maybe the word Temple should be changed to Pillar or Prayer (Prayer for the Lost)

I think the best idea to make the 'Pillars' work is not via influence.

But to make a faction-specific ring of Prayer around a system, which steadily grows.

And when another system is in the ring of Prayer, it can be given to Isyander.