The Corruption of the Church, Part 2

Over the centuries, false doctrine has made its way into the church in many forms, and today there are millions of people being taught things that are absolutely untrue. Many people are told to pray to Mary, that she was sinless, that she is a co-savior with Christ, and even that she rose from the dead and ascended to heaven! How is it possible that churches can teach such things when there is not one verse in the entire Bible to verify these false claims? How did such lies make their way into the church, and what should our response be?