And what happens when you ask and they ignore it? You're still back to square one where you're going to have to do what I already said anyway - get inquisitors. The AI doesn't 'respect' your requests, so if you want to fix this 'problem' you need to fix them all, and it just doesn't seem likely. You can ask them not to settle, they'll still do whatever they want, only you just gave yourself a negative modifier for no reason. You can ask them not to spy, they'll still do whatever they want, only you just gave yourself a negative modifier.
By the way, there are other situations you can't repeat either. You can't tell them to gtfo of your borders with their armies. You can't tell them to leave the city-states you're buddying up with alone.
You have the tools in place to already deal with this situation, but you want to make some intense changes to the game instead. Buy a few inquisitors early when costs are low and station them appropriately to deal with the situation. Declare war, capture and delete the prophets, destroy the other civs, spread your own GP's around to beat back with massive pressure, settle addtional cities to increase pressure, refuse open borders to kill off normal missionaries, etc. etc.
but calling it "laziness", "stupidity", being flat-out wrong about inquisitor prevention, fallacious, and attacking other people doesn't really help your argument