You can activate the Mongols as a faction that's called Mongols but you won't have any units different to the Japanese factions. Our intention always was to import the Mongol units from Shogun: The Mongol Invasion. Time didn't permit that yet. There are almost 30 Japanese clans in beta_8 and I don't think there's much point in having another one just for the sake of having a faction called Mongols that's not different from the others. Another problem with the Mongols is that they're very difficult to playbalance in MP. (There was much discussion already about that topic)
Changing the religion of a faction is a rather complex endeavour. There's a whole file structure for the different cultures/ religions and all the required files need to be there before it works.
Making a unit available only for MP works by using the "No_Faction" instead of the "All_Factions" or a specific faction trigger.
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