According to a statement by Roman Catholic Archdiocese of Mexico City on November 3, 2008, popular devotion to the so-called "Saint Death" is not compatible with the Catholic faith ...
Cult spokesman David Romo Guillén, who styles himself as a bishop, declared that his group "The Mexico-US Tridentine Catholic Church" or "The Traditional Catholic Mex-USA Church" has temples in Mexico and prayer groups in the US – including Texas, California, and Washington DC. However, a spokesman of the Catholic Archdiocese of Washington DC in an email response to Spero News declared that he "had no knowledge" of the cult, while no response was forthcoming from the Los Angeles Catholic archdiocese about St. Death ...
Catholic Church authorities concur that Santa Muerte seeks to lull the uninformed into believing that the cult represents an authentic form of Christianity. Apparently lending credence to this assertion, Santa Muerte cult spokesman Romo has spoken of himself to the press as "bishop" and further emulates the Catholic Church by wearing garb typical of Catholic clerics. Romo and other "priests" of Santa Muerte even hear confessions, but espouse a theology at odds with any recognizable form of Christianity. Reuters news service helped along the farce by referring to Romo as a "Catholic" priest, while the Mexican newspaper "La Reforma" refers to the cult as "Catholic, albeit not Roman" ...
http://banderasnews.com/0811/edat-santamuerte.htm