What was a major difference between Latin-speaking Roman Catholic Christians and Greek-speaking Eastern Orthodox Christians?

Another difference between these two is related to the language used during church services. In Roman Catholic churches, services are held in Latin, while in Greek Orthodox churches, native languages are used. Another difference between the two religions is the concept of original sin.

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geography

this is because warmer climates often don't get people sick from the flu and regions where it was often colder more people received the flu. hope this if you need more reasoning i am here to