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Well of course if you never interact with Europe/Catholics the council of Trent won't affect you. Just like protestant features aren't likely to affect you either.

Very good - my original ask was if anyone noticed it in-game really, because I haven't playing in Europe - seems to be a bit underwhelming altogether; click the button, forget. Someone pointed out that it had a big impact on a non-Christian game of his; hence the question - does it really have an impact if you're playing as a non-Christian country, because it doesn't seem to bother my game playing Catholic / Protestant / Anglican / whatever.