I'm not sure what there is to discuss! Of course you are right.
But then, they also call the Pope "Pope" which also means 'Father."
Here are a few other titles popes have assumed:
Pope Titles assumed by the popes.
Universal Bishop. Prior to Gregory the Great.
Servus Servorum. Assumed by Gregory the Great in 591.
The Lamb of God which taketh away the Sins of the World. Martin IV. in 1281.
Divine Majesty; Husband of the Church; Prince of the Apostles; Key of the whole Universe; the Pastor and Physician possessed of all Power both in Heaven and Earth. Leo X. in 1513.
Monarch of Christendom; Vice-God; Lord God the Pope. Paul V. in 1635.
Master of the World; the Universal Father; Viceregent of the Most High. Subsequent to Paul V.
(See Brady: Clavis Calendaria, 247.)
from http://www.bibliomania.com/2/3/255/1181 ... meset.html
He is also known as "Vicar of Christ" which implies "in place of Christ", as the root of vicarious is vicar! Thus, by replacing Christ on earth, a number of Popes, as shown above, have assumed Christ's titles as well!
You want heresy? The Roman Catholic church spells it in capital letters.