To be fair to the Society, they do not paint as harsh a picture of the early centuries as you allege, at least according to the following Watchtower article:
*** w70 8/15 494-5 Jehovah's Servants Are Different ***
" 22 Although shortly after the apostles fell asleep in death, “while men were sleeping,” an enemy, Satan the Devil, came and sowed weeds in the wheat field, the wheat field did not immediately become a field of weeds. (Matt. 13:25) And so early church historians tell us that in those early centuries Christians still stood out as different from those about them. This difference was apparent in at least four distinct respects. For one thing, they stood out as different from all the rest in the matter of religion. Not only were their beliefs and form of worship distinctive but they uniquely claimed that they alone were the true religion and all the others were false. It took courage to make that claim. As one church historian expressed it: “To the Christian, his God could never be placed in the same category as Isis or Mithras or Augustus.” Roman emperors were tolerant of different religions but not of one that taught “that the gods of Rome and of all other religions were alike false, and which strove to win over all mankind to that belief.
23 Those early Christians also stood out as different in their relationship with other parts of that system of things. On the one hand they refused to hold office in the government and to serve in the armies of Caesar, and, on the other hand, they ceased being materialists. Material riches were no longer the goal of their endeavors but merely a means used in furthering their preaching activity.
24 Similarly the early Christians stood out as different in regard to morals. All manner of immorality was rampant in the Roman and Greek civilizations of that time, sexual immorality even being a part of their worship, and sexual perversions, such as homosexuality, were rife. Historians record how different the early Christians were from those about them also in this respect: “We have the testimony to their blameless lives, to their irreproachable morals, to their good citizenship, and to their Christian graces.”
25 And finally, these early Christians stood out as different in their great unselfish love for one another, even as Jesus said would be the case: “By this all will know that you are my disciples, if you have love among yourselves.”—John 13:34, 35.
26 No question about it. The record, both inspired and otherwise, testifies to the fact that Jehovah’s servants were different from those about them, from the time of Abel to the early postapostolic centuries. But what about our day? Is this still the case? It is, even as the next article will show."