You need to check out were Christianity was...where the Roman Empire was not at the time.
No Christians on the North Pole.
Not sure what you are referring to here...Christianity grew under the protection of the Roman Empire.
It was the fall of the empire that gave rise to Catholicism. If pagan Rome protected anything, it was apostasy. "And the dragon (pagan Rome) that gave the beast (Papal Rome) its throne, its power and authority". Revelation 13.
Christianity had spread to throughout the empire it is true, well before the rise of the Papacy. It is also true that pagan Rome was opposed to this new religion which refused to bow down to the emperor and acknowledge him as their god. But despite this opposition, the church grew exponentially. but not only in the empire. In those early centuries the church became established in the east. From Assyria up to Afghanistan, across the old silk road as far as China, and as far south as Persia, India, and even to the Philippines. When the empire began to crumble in the 4th century, and Europe become over-run by Germanic tribes from the north, even these had accepted Christianity. When the Catholic church came to civil power in Rome in the 6th century, those Arian tribes were immediately marked as enemies of the state, and obliterated. (The 3 horns uprooted...Daniel 7)
You said no prophecy had foretold of those Papal persecutions. I disagree.
Daniel 7:19 Then I would know the truth of the fourth beast
(Pagan Rome), which was diverse from all the others, exceeding dreadful, whose teeth were of iron, and his nails of brass; which devoured, brake in pieces, and stamped the residue with his feet;
20 And of the ten horns that were in his head,(ten Barbarian tribes) and of the other (Papacy) which came up, and before whom three fell (Vandals, Heruli, and Ostrogoths); even of that horn that had eyes, and a mouth that spake very great things, whose look was more stout than his fellows.
21 I beheld, and the same horn (Papacy) made war with the saints, and prevailed against them;
Revelation 13:7 And it was given unto him (Papacy) to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations. (Yet to be seen, but quickly coming to pass today).
8 And all that dwell upon the earth shall worship (surrender to his authority) him, whose names are not written in the book of life of the Lamb slain from the foundation of the world.
Revelation 12:6 And the woman (the church of God...Christians)
fled into the wilderness, (everywhere other than that territory under the aegis of either pagan or later, Papal Rome)
.where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days. (Prophetic time...1260 years ...from 538 ad (the time Belisarius took Rome from the Ostrogoths and gave the bishop of Rome the freedom to execute civil authority...declare the death sentence upon heretics as granted him officially 5 years earlier by Justinian) to 1798 when General Berthier of Napoleon's Revolutionary army entered Rome and took the Pope captive ending that period of Papal civil authority).
That period refers directly to the church's escape from persecution and God's providence in protecting her.
This same period, is here referring to those persecutions from a different perspective, whereby the power to persecute is granted the gentiles for a particular period, during which time God's witnesses, the old and new testaments (witnesses) would be with-held from the people.
Revelation 10:2 But the court which is without the temple leave out, and measure it not; for it is given unto the Gentiles: and the holy city shall they tread under foot forty and two months.
3 ¶ And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.
4 These are the two olive trees, and the two candlesticks standing before the God of the earth.
We see it again here...in reference to papal power over the saints,
Daniel 7:25 And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.
Daniel 12:7 And I heard the man clothed in linen, which was upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that it shall be for a time, times, and an half; and when he shall have accomplished to scatter the power of the holy people, all these things shall be finished.
And again here in reference to Gods protection...
Re 12:14 And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent.