I agree with what you are saying and, quite frankly, I don't know why it's so hard to put into practice. Anyone with a cursory knowledge of the early church understands that much of our present-day "theology" was derived from ancient cultural and philosophical assimilation. In other words, they did the best they could with the knowledge they had. Most of the "players" in the early church were trained in philosophy in an era in which theology was essentially unknown. We have no problem adapting to advancements in science, medicine and technology but when it comes to theology all bets are off... this, IMHO, a result of the early church being modeled after  pagan and imperial Rome, from the elevation of Pontifex Maximus right down through the evolution of the seven sacraments. There is no reason to cling to these ancient memes, except to those who hold that "Tradition" is tantamount to the mind and will of God.