Cardinal Newman, esteemed to sainthood in the Catholic Church, said famously in his “Essay” that much of what is widely accepted as Christian doctrine is in fact borrowed from paganism and recognized as imperfect divine revelation.
You mean like the ubiquitous (maybe universal) pagan "dying god" (most often a corn god), who dies and rises again?
Do you have an actual quote from Newman or a Dowdified or distorted paraphrase from an anti-Catholic site?
I do not think Newman is a saint and I have never heard him quoted by a Protestant