You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Celtic Christianity survives and becomes Rome's spiritual rival and not protestantism, with Ireland, Britain, northern France, Spain Portugal and western Germany having converted to this while all the rest remain the same with Celtic Christian minorities in Scandanavia which is largely Catholic
Strife in catholic southern France and the rest of Germany as they feel religiously oppressed which leads to a series of wars like the religious ones in real history