Yes, the nation of Greece is 98% Greek Orthodox, which is one of the oldest branches of the Oldest Christian Church.
The orhodox faith differs from the Catholic in hierarchal structure as well as spiritual tradions, but teachings and dogma are pretty similar.
Other 2% of Greeks are from the Catholic, Jewish, or Islamic Faith mostly from the Islamic and Jewish faith.
Cristianity
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cristianity
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cristianity
cristianity
The Bible.
Saul spread Christianity
The kingdom of Cristianity
Cristianity
they are all monotheistic
There are no specific dress rules.