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There is such a decision already actually. It had some issues with AI acceptance that will be fixed in next patch though.
Even after the patch they may not switch immediately.
 
Ah this is true yes. In the general case @Vetgirig is right. It's just that in the specific case of the trade policy conversions that the OP brought up there is a decision.
 
What decision is that? I wasn't able to find any in the decisions folder.

Iirc in the same file where all other religion decisions are :) not able to check right now but it should be something like “religion.txt” in the decisions folder :)
 
In that case, the OP is right, there is no such decision. At least in 1.23.1. There is a decision to change ruler religion but that is not what the thread is about. There is no way to change state religion to Islam without rebels.

I just checked and it's in the file as I stated, on line 539. "trade_propagation_convert_to_islam". :)