The Church, in accordance with Jesus’ call in the Sermon on the Mount: “Blessed are the peacemakers, for they shall be called the children of God” (Matt 5:9), has proclaimed the message of peace and reconciliation from the very beginning and has taken action to promote peace. The messages of recent Popes for the World Day of Peace emphasize that peace is both a gift from God and a task. A significant contribution to the implementation of this task can be attributed to the Church’s charitable work, especially in areas affected by war or social conflict. The aim of the article is to try to create arguments for the credibility of the Church from combining its concern for the implementation of a message of peace with the commitment for charity. Such a specific research task is implemented in the case of an interpretation of the charity of the Opole Church in the service of peace and reconciliation. The author is looking for the answer to the question when the charitable aid of the Church to the victims of war is a contribution to building peace and reconciliation, and at the same time can become a sign of the credibility of the Church. In the course of analysis, first presents the theological foundations of the Church’s care for peace and reconciliation (1); then the specific forms of the help of Caritas of the Opole diocese to the victims of the war in Ukraine (2); in the last part of the article, he makes an analysis of the charitable involvement of the Opole Church from the fundamental theological perspective of presenting the argument for the credibility of the Church (3).