There is a great description of Bogomilism here: https://en.wikipedia.org/wiki/Bogomilism
Genre: RELIGION / Blasphemy, Heresy & ApostasyThe belief that there had existed through all the ages since the Christian era churches which adhered strictly to scriptural doctrines and practice—churches which were the true successors in faith and ordinances of those founded by the apostles, and had never paid homage to Greek patriarch or Roman pope—was firmly impressed upon the minds of the Baptist church-historians of the first fifty years of the present century. They believed also that these churches were essentially Baptist in their character, and some of them made extensive researches among the works of secular and ecclesiastical historians of the early centuries to find tangible proofs to sustain their conviction. They were partially, but only partially, successful, for the historians of those periods were ecclesiastics of either the Greek or Roman churches, who added, in most cases, the bitterness of personal spite, from their discomfiture by the elders of these churches, to their horror at any departure from papal or patriarchal decrees.
For the last twenty-five or thirty years the ranks of the Baptist ministry have been so largely recruited from Paedobaptist churches—all of which had their origin, confessedly, either at the Reformation or since—that many of our writers have been disposed to hold in abeyance their claims to an earlier origin, and to say that it was a matter of no consequence, but there was no evidence attainable of the existence of Baptist churches between the fourth and the eleventh or twelfth centuries.
