Arminianism is the very essence of Popery. Christopher Ness of St. John's College, Cambridge, a Puritan divine, in his treatise "An Antidote Against Arminianism," recommended by the great Dr. John Owen, writes...
"As blessed Athanasius sighed out in his day, 'The world is overrun with Arianism; so it is the sad sigh of our present times, the Christian world is overrun, yea, overwhelmed with the flood of Arminianism; which cometh as it were, out of the mouth of the serpent, that he might cause the woman (the Church) to be carried away of the flood thereof.' [Rev. 12.15.]
He quotes Mr. Rous, Master of Eton College, as saying, 'Arminianism is the spawn of Popery, which the warmth of favour may easily turn into frogs of the bottomless pit,' and Dr. Alexander Leighton who calls Arminianism 'the Pope's Benjamin, the last and greatest monster of the man of sin: the elixir of Anti-Christianism; the mystery of the mystery of iniquity; the Pope's cabinet; the very quintessence of equivocation.'"
http://www.truecovenanter.com/gospel/arminianism_another_gospel.html