Why did the Roman authorities believe that Christianity was dangerous? Romans disliked the ways Christians worshipped their gods.
Romans were angry after the Christians started a fire in Rome.
Romans feared that Christians would persecute them for their beliefs.
Romans were afraid that Christians would rebel against the government.

Romans were afraid that Christians would rebel against the government.

Explanation:

The Roman religion was polytheistic, and the Romans were tolerant of other religions as long as they did not upset the social order. Christianity religion was monotheistic, and they refused to worship other gods. Christianity spread throughout the Roman Empire by apostles and missionaries. Romans was Christian as a threat, and they persecuted many people to avoid rebel against the government.

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).