But part of the Church the Catholics would claim as Roman Catholic. Rot starts at the head . The presence of absence of writing from 250 AD proves nothing. The Catholic Church would hardly preserve writings that disagreed with them. You are creating straw man by your demand for manuscripts from 250 AD. The point is the Catholic Church has many apostate and heretical teachings called out time after time not when we have a document calling them out. Even today if the Catholic Church would repent of its heresy it would be welcomed by Christians everywhere
Perhaps if Rome had stuck with those and those alone they wouldn't have drifted into the false areas of teaching they've so well documented.
Sure it would! Do you know where our only remaining text of the pagan writer Celsus comes from? Origen's refutation: "Against Celsus". Do you know how we know so much about the Manichaeans? Because Augustine spends so much time listing and then attacking their positions. What do you think fills the pages of Irenaeus's "Against Heresies" but a whole bunch of condemned, heretical ideas?
Catholics proudly preserved writings they disagreed with because they thought they did such a first-rate job disagreeing with them.