Catholic Catechism #969 "Therefore the Blessed Virgin is invoked in the Church under the titles of Advocate, Helper, Benefactress, and Mediatrix."
Clearly the Catholic Church has lifted titles for the Holy Spirit and applied them to Mary. The title Mediatrix is the feminized version of Jesus' title as Mediator. The RCC makes Mary a co-mediator.
Catholic Catechism # 882 The Pope, Bishop of Rome and Peter's successor, "is the perpetual and visible source and foundation of the unity both of the bishops and of the whole company of the faithful. For the Roman Pontiff, by reason of his office as Vicar of Christ, and as pastor of the entire Church has full, supreme, and universal power over the whole Church, a power which he can always exercise unhindered."
The Pope sees himself as the visible head of God' Kingdom on earth as opposed to the invisible authority of Jesus Christ. However, early Christians walked by faith, not by sight (2 Cor. 5:7). Additionally, one of the Pope's titles is the Vicar of Christ. The word vicar comes from the Latin word vicarius meaning substitution. The on-line version of the Pocket Catholic Dictionary defines the Vicar of Christ as: "The Pope, visible head of the Church on earth, acting for and in the place of Christ". However, this is in serious conflict with scripture. Can there be two heads on one body?
... Christ is the head of the church: and he is the saviour of the body. - Ephesians 5:23
1994 Catholic Catechism Paragraph # 82 - As a result the Church, to whom the transmission and interpretation of Revelation is entrusted, does not derive her certainty about all revealed truths from the Holy Scriptures alone. Both Scripture and Tradition must be accepted and honored with equal sentiments of devotion and reverence.
While the Roman Catholic Church seems content with merely sharing Christ's Mediatorship, the Watchtower Corporation has completely severed Christ's Head as Mediator from off the body of the congregation. The February 15, 1991 issue of the Watchtower, pgs. 15-20 paragraph 11; makes this announcement:
11 Nevertheless, in a preliminary way, the great crowd have already "washed their robes and made them white in the blood of the Lamb." (Revelation 7:14) Christ does not act as Mediator of the new covenant toward them, yet they benefit from this covenant through the work of God's Kingdom.
Similar to the Catholic Church, the Watchtower also applies exclusive titles of Jesus to their organization. Members are socialized to refer to their organization as "The Truth". This is a title taken directly from Jesus Christ as the Word of God:
Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. - John 14: 6
Also like the Catholic Church which demands its traditions and unique teachings be equal to that of the bible, the Watchtower views its teachings as part of the bible with the same authority:
Watchtower December 15 2008, pg 28 - Our coming to know "the truth" - the entire body of Christian teachings that has become part of the Bible - and adhering to it are essential for our salvation.
Simply put, the Catholic Church, the Watchtower Corporation, and others have made the deadly mistake that other foolish people have made; they've added their traditions, good works, and another mediator to "Jesus the author and finisher of our faith". (Heb. 12:2) Because of this, they have nullified God's offer of salvation for some. (Mark 7:13) There is only one way into God's favor:
I say unto you, He that entereth not by the door into the sheepfold , but climbeth up some other way, the same is a thief and a robber...Verily, verily, I say unto you, I am the door of the sheep. - Jn.10: 1-7
Faith in Christ ALONE is the only way folks. Don't get this wrong twice.