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Ecumenism

"Ecumenism is the concept and principle that Christians who belong to different Christian denominations should work together to develop closer relationships among their churches and promote Christian unity." - from Wikipedia

This mod gives all Christian nations access to every Christian holy order, barring the Jesuits, who are still Catholic exclusive.

Also gives the holy war CB the ability to force heathen nations to change religion, but you will lose your decrease in cost to take provinces. Deus Vult!