MrT asked me to remind about this matter, after 1.05 is out.
I brought this up in final stages of beta process. I was playing as Venice (originally Toscana) and I had conquered Sicily. My vassal duke of Sicily had a vassal, who was bishop of Malta. This poor fellow died only days after becoming bishop and his successor was muslim. All his courtiers were muslims and province was muslim religion. This muslim guy was happily bishop of Malta over 20 years. Then I killed him by using die-cheat. His successor was a muslim. So I killed every person in his court and then killed him. No change, game generated random muslim bishop. So situation was that there was bishopric, which was be eternally doomed to be muslim.
I brought this up in final stages of beta process. I was playing as Venice (originally Toscana) and I had conquered Sicily. My vassal duke of Sicily had a vassal, who was bishop of Malta. This poor fellow died only days after becoming bishop and his successor was muslim. All his courtiers were muslims and province was muslim religion. This muslim guy was happily bishop of Malta over 20 years. Then I killed him by using die-cheat. His successor was a muslim. So I killed every person in his court and then killed him. No change, game generated random muslim bishop. So situation was that there was bishopric, which was be eternally doomed to be muslim.