The Celtic Church follows the teachings of St. John of Ephesus that emphasised the relationship and community rather than outward acts of righteousness and hierarchies of ecclesiastical authority. This doctrine clearly shows the influence of the Jewish Qumran community, who saw man and nature as existing in a relationship of balance rather than structured hierarchies of power. The Celtic Church has always maintained a reverence for nature. St. Ciran and Columcille were notable saints who loved animals and respected nature. The rite for blessing animals is attributed to St. Columcille.

The Celtic Church is a branch of the One, Holy, Catholic and Apostolic Church. The members of the Celtic Church influenced the Western Church considerably, e.g. the Canon of the Roman-Catholic Church, and they felt as members of the One Church in Christ. We do not add anything to the Holy Scriptures, nor do we take anything away. But we don´t adhere to false doctrines that are not biblically based like the Rapture, Original Sin or Purgatory. We believe some things remain a mystery and that we are incapable of fully understanding everything.

The Celtic Church and its monks have made a considerable contribution to missionary work in France and Germany since the 6th century. Some examples of this include Saint Columba the Younger in France, Pirmin in Southern Germany as well as Marin and Anian in Bavaria. More information can be found in Wikipedia.

There has been a revival of the Celtic Church in Ireland, Scotland and France. Furthermore, the Celtic Church is also active again in the USA and Germany. The Celtic Apostolic Church is active in Scotland and the British Islands as well as in the USA and also in Germany since 2011. The Celtic Apostolic Church in Germany is one of the founding members of the Ecumenical Council of Celtic Churches in Germany and merged with the Orthodox Celtic Germanic Church to the Celtic Church in Germany in October 2011.