The Catholic Church was established by the Roman Government.
This is no surprise.
The Catholic Church was established by Christ. The Roman Government merely recognized it as the faith Christ established and declared it the faith of the empire. The Catholic Church already existed for 350 years by that point.
It's always been a political operation.
Part IV. Of the Kingdom of Darkness
Chap. xlvii. Of the Benefit that proceedeth from such Darkness[21] ...For from the time that the Bishop of Rome had gotten to be acknowledged for bishop universal, by pretense of succession to St. Peter, their whole hierarchy (or kingdom of darkness) may be compared not unfitly to the kingdom of fairies (that is, to the old wives' fables in England, concerning ghosts and spirits and the feats they play in the night). And if a man consider the original of this ecclesiastical dominion, he will easily perceive that the Papacy is no other than the ghost of the deceased Roman empire sitting crowned upon the grave thereof. For so did the Papacy start out of the ruins of that heathen power.
[22] The language also which they use (both in the churches and in their public acts) being Latin, which is not commonly used by any nation now in the world, what is it but the ghost of the old Roman language?
[23] The fairies, in what nation soever they converse, have but one universal king, which some poets of ours call King Oberon; but the Scripture calls Beelzebub, prince of demons. The ecclesiastics likewise, in whose dominions soever they be found, acknowledge but one universal king, the Pope.
Hobbes, Thomas. Leviathan: with selected variants from the Latin edition of 1668. Ed. Edwin Curley. Indianapolis: Hackett, 1994.
http://oregonstate.edu/instruct/phl302/texts/hobbes/leviathan-contents.html