"You do realize that being called a Protestant is not an insult."  Unfortunately, it isn't among many Catholics.  Because of a prideful rebellion against the Church, there are now hundreds of Christianities, none of which (other than the RCC) offer a sacramental life.  A sacramental life may not be necessary (or then again, it may be), but it is highly beneficial to salvation.  By breaking away, heretics broke up the Body of Christ, and worse, made salvation more difficult for their followers.