Protestantism is unbiblical, Sola Scriptura is unbiblical, sectarianism is unbiblical.
The Pope is unBiblical.
Mary’s ascension to Heaven is ubBiblical.
Much of Roman Catholicism is Biblical. Mind you it is forbidden, but that is still technically Biblical.
Then the Catholic church is also unbiblical because there are at least 22 sects (relabeled as *rites*) in Catholicism. The RCC and EO have been at odds with each other for hundreds of years, each counting themselves as the original Catholic church and the other as in schism.
So who's correct?