Shankill Road based band the Young Conway Volunteers was banned from parading past Saint Patrick's Church on Donegall Street in Belfast by the Parades Commission after being filmed playing an allegedly sectarian song at the spot during July 12 demonstrations.
However the band defied the ban during the Royal Black Preceptory Parade on August 25.
Bishop Treanor said “This behaviour is not worthy of our city, nor of the Christian ideals espoused by the Royal Black Preceptory and other organisations involved.”
He was also critical of Unionist politicians who had signed a letter calling for the replacement of the Parades Commission.
“The one-sided nature of this letter and the failure to acknowledge past and present behaviours that give rise to just opposition to such marches in a small number of areas, reflects a failed, partisan and unjust politics of the past.”
Bishop Treanor also asked police to explain their actions, claiming there was a lack of visible effort to enforce the commission's determination.
“As we seek to build that more tolerant future together, all public anniversaries should be shaped as moments for courageous leadership and new vision, rather than encouraging hatred or for creating the conditions which might provoke violence. It is long since time to stop reverting to the intolerant and disrespectful ways of the past. It is time to consolidate and sustain respect for all traditions in our society, and particularly on occasions of commemoration."
“It is time to foster freedom of religion for all and respect for every church, temple and place of worship without exception. It is time to leave provocation behind us. Critically it is time to shape for our youth, our children and future generations, mentalities and patterns of respect for one another as citizens and human persons.”