Mary is an idol when she is prayed to
The English word we use “to pray” or “prayer” comes from a Latin word “precari” which translates into a Middle English word of French derivation “preier” or simply “pray” (originating before the 13th century). In Latin and the Latin derivatives, there is no distinction in the word “pray” to mean directly to God alone and to others. Okay, so that’s the linguistic derivation. . .
“To pray” has a broad definition in its original Middle English language to mean “to ask” or “to request.” This original broad meaning of the word “pray” is not exclusively spiritual. In the 16th century, during the Protestant Reformation, the word “to pray” began to take on a more restrictive definition to mean “to pray to God.” We know this because we still have indications of the broader usage in our language even today. One is found in the British expression, “prithee” which is contraction of the expression “ I pray thee” (as in, “prithee, fetch the book”). If some one has something to say to someone, we know that a common request for that information is “pray, tell.”
Even our modern court documents often point to the broader sense of the word as in “Defendant A prays the court will. . .” The idea of “praying” to another person in these cases, of course, never entails giving Godly worship to them. This is the Catholic notion of “praying” to Mary or the saints. English speaking Catholics of the 16th century and since simply haven’t excluded the broader usage of the word “pray” to mean “ask.”
The exclusive meaning of “to pray” referring to prayer to God only became the tradition of the English speaking Protestants in speaking “the King’s English” especially with respect to beliefs espoused by the Protestant trend. The meanings of “praying” to God and praying to Mary or the saints (or to each other or to a court, for that matter) are very, very different.
SO, with that said. . .Catholics do “pray” to Mary and the saints, just as we “pray” to each other when we have “prayer to God” requests. We do not give Mary or the saints or each other Divine worship. Prayer ultimately, and linguistically, is a type of communication in the form of a request. There are certain communications that are only proper to give to God. Worship is one. In fact, we have a commandment that tells us “I, the Lord, am your God. . .You shall not have other gods besides me. . .you shall not bow down before them [other gods] or worship them” (Ex. 20:2-5). This is a very clear doctrinal teaching on how we are to communicate only with God. In these same ten commandments, however, we are told to “Honor your father and your mother.” We know that we are to “honor” God also, of course. However, the ways in which we “honor” our parents are far inferior to the ways in which we “honor” God. Prayers are the same. We ask, request, or pray to Mary and the saints in ways that are separate and FAR inferior to the “prayer” we give to God. In fact, we know that it is only through Jesus that our “prayers” are heard. It is not by the power or merit of anyone other than Jesus that we even have the ability to reach the ears of God. However, we know that our prayers for each other are effective and heard by God through Christ, the One Mediator.