ckii

Find a way for the Zunist religion (TL;DR Sun-worshipping Afghans in the late 800s) to survive the Islamic conquests of Afghanistan, or alternatively have the Zoroastrians survive in Iran long enough that the Zunists manage to reinforce their position, or even find a new place to settle in...

So CKII rightly gets a lot of slack for its portrayal of what happens to the marginalised faiths when they "reform" which inevitably leads to centralisation in that game. Just like with Vicky II we can forgive some of this due to its gamey nature, but are there any real life examples of attempts...