I wrote about Ranagol in the history a lot, what I don't really want to repeat. His monotheistic faith was for non-human races first then adopted by Humans as they became more and more powerful factor on Ynev and Ranagol recognized this shift. He's worshiped officially in two countries: Krán and Gorvik but numberless cults are working for him on all over Ynev. He's the most influential in the South, where several city states also sacrifices to him. The two countries worship him in different ways.
In Krán it's a more personal thing, while there are clerics no official state level church exists. Here however on many occasion they worship him through his Chaos-Angels, who are deified entities - basically monstrosities for outsiders - and many chaos-sects dedicated to and for them exist in and outside the country. Supposedly we can't know much about how the religion works in Krán as the Pyar clergy and scientists don't have many sources. Even the Handbook of Clerics and Paladins covers only the religion of Gorvik. However I remember reading somewhere about a blood lottery which decides who gets to be sacrificed to Ranagol (or his Chaos-Angels). The "lucky" ones have a short window of opportunity to relegate others instead of themselves.
In Gorvik which is a pure Human country and the leading strata of society came from Shadon - the home of the ultra-organised religion - the formation of the church was inevitable. Here clerics tend the spiritual life of the inhabitants and make the offerings in the name of the communities they represent, directly to Ranagol - the notion of Chaos-Angels is a heretic thought. This country was founded by a cleric so it's not surprising that two (or maybe three I'm not sure) of the five province is lead by ranashaviks. In Gorvik they value the ties of family a lot, but it can be artificial family too like a guild, clan (as in thief, assassin clan, and not gens) or chivalric order. The peeps here idolize the perfect human bean and they are pretty racist toward non-human races and they view every other human ethnicities the examples of imperfectness or straight failures. They also revere saints who are badass psychos. Their sacrifices are rarely deadly, they do such only on more important feasts in larger temples. The more common type of sacrifice is to offer the pain, the suffering of sinners, those who violate the rule of emergence (to become Übermensch basically). They view emotions as sin and as they are very temperamental people I guess there are always much surplus in sinners who has to atone. With the torturing of mentioned sinners they purify them and their communities from sin. They can also relegate others to suffer instead of them. These guys are very sadomasochistic and tales/modules played in Gorvik are always full torture chambers and flogging. No exceptions.