Only God is capable of the opinion that it IS God (genuinely).
So, God is not supposed to have horcruxes of himself in other people's brains.
Therefore, God is supposed to be a lonely God.
And, sanity is about settling the competing voices in your brain.
Which are not God, and therefore, can be settled.
There are two upshots of this:
1. If you think little (if people think you're an idiot) then think slightly more than usual, but less than people think you think.
2. If you think a lot, then chaos is the answer!
3. Or, be a lonely God.