"But there is no union between the Prince of light and the prince of darkness, and there can be no union between their followers. When Christians consented to unite with those who were but half converted from paganism, they entered upon a path which led further and further from the truth. Satan exulted that he had succeeded in deceiving so large a number of the followers of Christ. He then brought his power to bear more fully upon these, and inspired them to persecute those who remained true to God. None understood so well how to oppose the true Christian faith as did those who had once been its defenders; and these apostate Christians, uniting with their half-pagan companions, directed their warfare against the most essential features of the doctrines of Christ." [pp.36-37] ellen white the great controversy https://media4.egwwritings.org/pdf/en_GC.pdf