Answer :
The Christians came into conflict with the Roman Empire because Romans did not permit conquered people to worship their own gods.
How did its later spread in Roman Empire?
In the empire, the religion was later spread by the apostles and missionaries when the emperor Constantine became a Christian.
However, in the early days, the Christians came into conflict with the Roman Empire because Romans did not permit conquered people to worship their own gods.
Therefore, the Option A is correct.
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