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宗教はCrusader Kings IIのはたらきの核である。きみはキリスト教のキャラクターでしかプレイ出来ないのだから（きみがその制限を回避しないかぎり。これについてのいくつかの情報は後で）、この節はキリスト教の視点からである。私は宗教の伝播や異端といったことについて論じよう。 いつもの通り、最後にはまとめが載せてある。
Crusader Kings IIにおいて、Provinceとキャラクターは何らかの宗派に従っており、これは彼らとほかのキャラクターとの相互関係に大きな効果を与え得る。もしProvinceがその君主と異なった宗派であれば、その叛乱危険性（revolt risk）は8%上昇する；これは異なった文化グループによる2%のペナルティーよりもはるかに大きい。 特定のキャラクターの観点からすれば、異なった宗教グループの者は異教徒（infidel）であり、同じ宗教サブ・グループ（たとえばキリスト教・カトリックなど）のうちの異なった宗教は異端（heretic）である。異教徒は相互に-30の評価修正を受け、異端は-35の評価修正を受ける。また同じ宗教の異なったサブ・グループ（たとえばカトリックと正教）は-10の評価修正を受ける。 このペナルティは宗教適応性（religious flexibility）の技術で、レベルごとに10%低下する。技術の節で述べたように、これは対象のキャラクターの首都となるcountyにおいてこのレベルが達成されていなければ効果を発揮しない。彼らの修正は、きみのではなく、彼らの首都の技術レベルに依拠していることに注意せよ。よってきみの宗教において宗教適応性が上昇しても、きみの異端/異教徒の対象がきみのことをより好きになることは、直接的にはない。しかしおそらくそれは彼らの技術スピードを速めることになるだろう。
Religions from different religious groups will only spread via inquisitions. As such, if you want a province converted to the One True Faith you and/or your vassals will need to use your Court Chaplains to actively convert the province. Heresy on the other hand can spread on its own. The rate of spread is primarily affected by the moral authority (MA) of the church, and I'll describe how that, and any other factors, affects it. MTTH means "mean time to happen" on a per province basis. The lower the number, the more often it will happen. Heresy appearing isolated:
As you can see, the moral authority can make a huge difference. Heresy will appear out of nowhere at a rate slighly above 7 times higher at a moral authority of 0-20 than at 80-100. At a moral authority of 0 to 20%, almost half of your provinces will statistically go heretic over the course of a campaign as the length of the campaign is only slightly below the MTTH (387 years as compared to 450). However, heresy can also spread from province to province, and this happens at a much higher rate:
As you can see, even at its slowest this spread is faster than heresy appearing out of nowhere at its fastest. Further, the MTTH is multiplied by 0.75 if the county borders two or more heretic counties, giving these numbers:
Heresy can also spread from counties to characters, and from character to character. Only courtiers can pick up heresies from provinces, but they can then spread it onto other characters. The factors affecting province to character spread are these:
As you can see, both traits and moral authority can make a huge difference here, with a range from 50 months to 7200. Further we've got, as mentioned earlier, character to character spread. Character to character spread can happen as long as the heretic is capable, 16+, and not a prisoner, and is in the same court as at least one other person that is capable, free, 16+, same religious group, has an opinion of 25+ of the heretic, and is not a heretic. Four traits (that the heretic may have) affect the chance of this happening, as well as the moral authority of the church. When this event triggers it will select a random character that fulfills all the earlier criteria, and fire an event for him/her asking him/her to convert to the heresy. As the total possibilities are so many, I'll list what the MTTH rather than the entire list:
As such, we get a range from 8.4375 months (zealous, diligent, and MA below 20%) to 14400 months (cynical, slothful, and MA over 80%) Now, this will not automatically make the target heretic. Instead, the target will have several choices; embracing the heresy, demanding the heretic converts back (can only be done if (s)he is the heretic's liege, and has a Diplomacy stat of 6+), imprisoning the heretic (has to be the heretic's liege, not a close relative, and have the zealous, wroth, or lunatic trait), or simply saying no. Without any modifiers, all of these choices are equally likely, but two factors modify the chance of embracing the heresy; being independent halves it, and being a king or emperor quarters it. As such, the ruler of an independent realm is unlikely to convert to a heresy, but it can happen. Do note that while infidel religions cannot spread to your courtiers this way, they can be spread by infidel vassals using their court chaplains. As such, you should avoid having infidel vassals (and with medium crown authority you can revoke their titles for free anyway)
Converting provinces is relatively simple, you just put your court chaplain in the province with the inquisition mission. Your vassals might do this as well. The chance of this happening is modified by several factors, both in the county and on the court chaplain's part:
As such, assuming you've got a descent court chaplain (skill 13 or higher) the MTTH ranges from 48 to 2430 months. MA can change the MTTH by a factor slightly above 14.
The pope has several powers. The first, and strongest, is crusades. The pope can call a crusade as long as the moral authority of the catholic church is 5% or higher. This calls for a religious war, generally against muslims, but after 1198 crusades can also be called upon pagans. The goal of a crusade is either to take an area considered holy by the catholic church, or to take back land taken from christians by another religious group. Second, but also importantly, the pope has the power to excommunicate catholic rulers as long as the moral authority of the church is above 20%. This will make the ruler's subjects get a major opinion penalty of -30 towards the ruler, and will give everyone the excommunicated ruler casus belli against the ruler. This costs the person who asked for excommunication 100 piety. Third, the pope can condone invasions. More detail on this in the installment on casus belli. This can be done as long as the MA of the church is above 30% Fourth, the pope can conduct divorces. Short of one part of the couple dying, this is the only way to end a marriage. This costs the person who asked for the divorce 100 piety, and will make the spouse's family unhappy. Fifth, all church taxes are paid to the pope unless the bishop prefers his liege or an antipope. This can be a huge amount of money per year, and as such the Papacy is usually one of the richest realms in the game.
On the other hand, there are also antipopes. Antipopes are bishops who directly challenge the popes authority, and thet are a constant drain on the moral authority of the church. An antipope has two of the powers that popes have; excommunication and taxation. The character who controls an antipope will be able to request excommunication of anyone in his realm, and he and all his vassals will be protected from excommunication by the real pope. This can be a major asset if the current pope doesn't like you, and you have political enemies with high enough piety, and good enough graces with the pope, to get you excommunicated. Second, an antipope also has the potential to bring in huge amounts of taxes. Every catholic bishop who prefers the antipope over the real pope will pay taxes to him instead, and every bishop in the realm of the antipope controller will get the head of religion opinion bonus of 10 towards the antipope rather than the real pope. The antipope will also have a claim upon the papacy, and by pushing this claim and winning the war, he will be installed as head of the catholic church, and the old pope will become an antipope with no successor. The split in the church will be gone upon the death of the ex-pope. The only real benefit to this is the +100 opinion modifier you'll get with the new pope, which will disappear upon succession. While an antipope has the major benefits of tax and protection from excommunication, it will be a gradual drain on the church's moral authority. Each antipope in existence will decrease the MA of the church by 0.1% per year, which will over time reduce the rate of spread of Catholicism while increasing the spread of heresy. Due to this major disadvantage I would not recommend holding onto an antipope for any major period of time unless you deliberately want to become a heretic.
You should use your court chaplain to spread your religion at all times, as then you'll end up with much fewer rebellions once you lose the 8% revolt risk from 'wrong religion'. This will also increase the MA of the church slightly every time a province converts, and the pope's opinion of you. Second, you should make sure your court chaplain has a skill of at least 13, or conversion will be slow. Third, concentrate on heretics before infidels, as your vassals will never convert to an infidel religion, but can convert to a heresy. The heresy penalty is also larger than the infidel penalty. Fourth, when converting provinces you should concentrate on those of your own culture and/or cultural group first, as these will convert faster. Fifth, completing crusades is a great way to increase moral authority, as well as gain the Crusader trait (makes all your bishops and the pope love you, and is gained the moment you set foot in the crusade target area), plus gain a few provinces. A 20% increase in moral authority can make a large difference when it comes to the spread of heresy and the One True Faith. Sixth, if you want to go heretic at some point, appoint an antipope as early as possible. The lower the moral authority of the church, the faster heresy will spread, and the easier a time you'll have converting yourself and your vassals to the heresy. Seventh, beware of having an antipope for any extended period of time, with the exception of the scenario above. While you'll rake in money for quite a while, as the MA of the church goes down, heresy will become rife, and your vassals will start hating you and the church taxes will dry up as less and less bishops follow your religion. Eight, don't keep counties of another religion for yourself, give them to a vassal instead. They'll have a court chaplain of their own that can convert their counties, thus speeding up the spread of your religion. Creating and giving out duchies also has the benefit of creating yet another court chaplain. However, you should try to keep your vassal holdings as small as possible, to maximize the number of court chaplains in existence.
正教の教会は対立教皇を持たず、十字軍を招集出来ず、すべての教会の税金はその司教の君主に行くということに注意せよ。自由/教皇叙任権も正教会派には当てはまらない。きみは司教が死んだとき誰が跡を継ぐのかコントロールすることは出来ない。 これは、きみの司教の税金がきみのところに来るため彼らを幸せにしておく必要がなく、また対立教皇が教会の倫理的権威を傷つけることは決してないということを意味している。しかしこれは、きみは十字軍の利益を決して得られないということもまた意味している。
教会を強いままにしておけば、きみはきみの宗教の素早い伝播の利益を刈り取り、異端を阻止することが出来るだろう。教会が弱体化すれば異端がはびこり、きみの宗教が広まるのは困難になるだろう。私のtipは以下の通りである：
