Agreed. Luther and Calvin like the Pope are humans and are known to error, which is precisely why we hold the Bible as truth.
Humans are ALL known to err. The problem I have with Protestantism is the defacto sixth Sola, "Sola Puto" (ut quod ego unus sumo ut puto) doctrine which means "that which I alone choose to believe". It recognizes the error in all others but retains for itself some special ability to personally infallibly interpret Scripture while denying that ability to Catholics.
Exactly..and humans have opinions and draw conclusions which are published via writings etc. But if these do not stand the test of scripture clearly then they are simply mans opinions....who is not perfected in this world.....regardless of who they are. Mary is honored by most...but to pray to her, bow down to her, kiss an image of her, and hold her up equal to or above Christ is far beyond honoring her...it''s worshiping her and dethrones Christ from His position as our only Savior and King.