Answer:
the Roman catholic and Greek orthodox churches.
Explanation:
The two main institutions that unified and constitutes European Christendom are the Roman Catholic and Greek Orthodox churches.
Few facts about the Roman Catholic and Greek Orthodox believers:
- They both have faith for the same God
- Roman considered Pope as error-free while Greek don't
- Roman believes that mother Mary doesn't commit any sin in her entire life while Greek doesn't have some thinking.
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