It said the mosque failed to represent the diversity of Irish Muslims, and had alienated the very community it was meant to serve.
The Islamic Cultural Centre in Clonskeagh in Dublin has been closed to the public after an incident at the weekend and remains closed today for Friday prayer.
In a statement, the Irish Muslim Peace and Integration Council said the moment "must be a turning point" and called for it to help transparency, unity, modernisation and the empowering of youth.
It said: "A mosque that ignores its youth has no future. The ICCI must provide spaces for young Muslims to lead, learn, and contribute …not be sidelined by outdated hierarchies."
The council said the ICCI "belongs to the Muslim community, not to any one group. It is time for a fresh start; one built on transparency, unity, and genuine service."
"The Irish Muslim Peace and Integration Council stands ready to assist in this process.
"With our experience in community representation, mediation, and institution building, we are willing to play an active role in reconciliation efforts and the reopening of the ICCI; ensuring it becomes the inclusive, transparent, and dynamic mosque that Irish Muslims deserve.
"The ICCI belongs to the Muslim community, not to any one group. It is time for a fresh start - one built on transparency, unity, and genuine service," the council said.
'Temporarily closed'
In a message yesterday to the Muslim community in Ireland, Imam of the mosque Sheikh Hussein Halawa described news of the closure of the centre as "distressing".
He described the centre as "a symbol of unity" and urged people to "verify the accuracy of any news you hear and not to be swept away by rumours."
In a statement this morning, the centre said the mosque had been temporarily closed by decision of the newly appointed Board of Directors.
It said this was "a preventive measure to ensure the safety and security of the property, staff, children and members of the public."
The statement said that on Saturday 19 April, the ICCI board had scheduled a closed-door meeting "specifically for the parents of children enrolled at the Quranic School to discuss school-related matters" but it said "attempts were made to disrupt the meeting and transform it into an open community gathering at an incorrect venue."
It said that following an incident "and in light of credible information received by the board regarding planned protests, including potential attempts to breach the centre's gates and forcibly take control of the premises - the board determined that maintaining security would be impossible if the centre remained open."
The statement continues: "The centre remains concerned about ongoing safety risks, particularly given reports that further protests may be organised with the intent to incite individuals to breach the gates and forcibly occupy ICCI premises. We trust the gardaí will continue to ensure the protection of the centre during this time."
The statement added: "The Centre reiterates that rumours of pressure from abroad or any external actors/parties are false and without foundation."
It said the ICCI will remain closed "as it undertakes a full review of its security posture. In the meantime, the board is also conducting a comprehensive audit to address and remedy the legal, financial, and governance issues it has inherited."
Nurul Huda Quranic School closed since April
The Nurul Huda Quranic School, which operated in the centre, has been closed since mid-April, following a dispute between the board and staff at the school.
Staff, including the school's principal and deputy principal, resigned on 9 April.
The school, which was established in 2000 and has over 1,000 students, teaches Quranic studies and Arabic and operates on Saturdays and Sundays and on some weekday evenings.
It is understood that the school has been re-registered and operates independently of the ICCI, offering classes to students via Zoom.
The Department of Education said in a statement that it is currently engaging with the school's patron.