Converting your faction

[Macunaíma]

Is there any way to convert yourself to another religion? Just wondering.

[Bonez]

I don't think.. Unless you bribe a priest or whatever.

[Teutonic Warlord]

No, you can't (or at the very least not in vanilla).

However, Lithuania can become Catholic in the Teutonic Campaign, and some mods allow factions to convert to certain religions. I believe AJ Stoner's Rule Brittania mod allows some factions to convert during the game.

[lolIsuck]

You'd have to script it.

[Ishan]

True via script you can change the religion but it takes effect for your entire faction, not just one character, that's impossible.