Scripture does warn to come out of the mother whore and her daughters. I believe that some of the daughters are the various denominations that teach doctrines of demons. The mother gave birth to them.
Rev 18:4-8: "And I heard another voice from heaven saying, “Come out of her, my people, lest you share in her sins, and lest you receive of her plagues. For her sins have reached to heaven, and God has remembered her iniquities. Render to her just as she rendered to you, and repay her double according to her works; in the cup which she has mixed, mix double for her. In the measure that she glorified herself and lived luxuriously, in the same measure give her torment and sorrow; for she says in her heart, ‘I sit as queen, and am no widow, and will not see sorrow.’ Therefore her plagues will come in one day—death and mourning and famine. And she will be utterly burned with fire, for strong is the Lord God who judges her"
It's true that many are following Rome. Even the prosperity gospel came from Rome, it just has another name for it. The idea that one can lose salvation is also a Roman teaching, etc, etc. You can look at most false teachings and clearly see their relationship with Rome. Don't be fooled by the different names used, the teachings often turn out to be the same.