I thinx a lot of you guys have seen this happen. You asked the AI to stop spreading his religion to youre cities and he says of course i won't do it anymore i see my errors. Then a few turns later he spams more missionaries to convert youre land this allows you to use the holy war casus belli to declare war. But how about giving us a new casus belli for when the AI ignores other request like: if he settles to close and you ask them to not do that but he still does it. But the best realistic casus belli would be : If AI ignores youre request for not spying on you. This is actually a realistic casus belli look at current USA that threatens war with russia because of spying incidents. not stopping to spy on someone can causes war and it can be called as a justified war because the other one provoked it.