He came from a wealthy municipal family of the Roman equestrian order, and is considered one of Rome's greatest orators and prose stylists. ... Though he was an accomplished orator and successful lawyer, Cicero believed his political career was his most important achievement.
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Answer:
The main reason why Christianity spread in the Byzantine Empire is that decades prior to the emergence of the Empire, Roman Emperor Constantine made Christianity the official religion of the Roman Empire, with they Edict of Milan, which he decreed in 313 AD.
We must remember that the Byzantine Empire is simply the Eastern Roman Empire, and when the Middle Ages started, the Byzantine Empire held land that had been christianizing for a over a century. Only a few areas of the Empire had to christianized in the Middle Ages, essentially areas at the edges of the Empire.