As we've argued before here on C - R, you can look at extreme cases of religion in two ways. (climate-resistance.org)
While a majority religion can be an ally of government or a tool of government, there are of course cases of a religion gaining control over government and effectively being government, and this often means religion policies dominating a society — especially «spread the religion». (globaleducationmagazine.com)
How canons are determined will be described in the case of each religion, but once fixed they are not subject to change. (religion-online.org)