Child Abuse Controversy

While being the German Bishops Conference's spokesman on child abuse issues he encouraged victims of child abuse to come forward, but later neglected actively to pursue investigations or impose harsh penalties.^[9][10] Ackermann had to issue a public apology after failing to immediately suspend a suspected pedophile priest in 2011 yet ignored press revelations about seven other cases of priests in the bishop's diocese who are suspected of having abused minors.^[11] In January 2011, the police informed his office that a pastor from Saarbrücken, the state capital, had allegedly abused minors. According to the guidelines of the German Bishops' Conference, prompt action had to be taken in such suspected cases, and the priest in question could be suspended until the accusations have been cleared up; nevertheless, despite these guidelines, and despite his status as the Church's spokesman on abuse issues, Ackermann allowed one suspected pedophile to remain in office. The priest continued to celebrate Mass and even held a dedication ceremony for a Catholic kindergarten in the summer. In the fall, another ceremony was held to mark his 70th birthday.^[12]

Diocesan Synod

On 29 June 2012, Bishop Ackermann proclaimed a diocesan synod that was constituted on 13 and 14 December 2013. It was the first synod in the diocese of Trier for almost 50 years.

Reform of Sexual Morality

In 2014, Ackermann said that the Roman Catholic Church should reform Roman Catholic sexual ethics. Same-sex marriages should be accepted and not be described as immoral^[13]

Parish Abolishment and Clergy Role reformation Plan

Bishop Ackermann has announced that the diocese will be closing almost all of its parishes, reducing 903 parishes and all relevant organizations to 35 new regional authorities. The parishes of the future will have nothing in common with the parish concept "but the name".^[14][15] The new entities will include limitation to the duties of the clergy and the introduction of new duties for the laity. According to Ackermann's plan, laypeople will have the right to make decisions and lead "traditional and new worship forms" and "there'll continue to be a priest who takes overall responsibility, but tasks and duties will also be distributed by the team – so there'll be less emphasis on the clergy's leadership, and more on its priestly and pastoral functions".^[16]

In 2017, Ackermann became the president of the Liturgy Commission of the German Bishop's Conference. Bishop Ackermann in 2017 also called for the abolition of nuclear weapons at the Buchel airfield.