In August 1906, Chief Apostle Niehaus ordained Apostle Helper Johann Gottfried Bischoff as District Apostle of the Middle Germany and Württemberg district, replacing the late Apostle Ruff.
He also renamed the Neuapostolische Gemeinde (New Apostolic Congregation) as Neuapostolische Kirche (New Apostolic Church) and created a public corporation for it.
He ordained numerous young ministers and regularly convened conferences of apostles.
He founded the periodical church publication Apostolisches Sonntagsblatt (Apostolic Sunday Paper), later Neuapostolische Rundschau (New Apostolic Review), in 1907 as an additional weekly publication to go along with Der Herold and Wächterstimme von Ephraim (Watchman's Voice of Ephraim).
In 1908 he issued the Allgemeinen Hausregeln (General House Rules) and in 1916 he wrote the first textbook about the New Apostolic faith Fragen  &  Antworten (Questions &  Answers).
This book still exists in its revised 1992 version, but will be replaced by the new catechism.

As the first of the Chief Apostles, Apostle Niehaus and Apostle Carl August Brückner visited United States congregations on 19 August 19, 1909.
The outbreak of war in 1914 brought high exposure to the church.
The soldiers at the frontlines were administered the Holy Communion by field post as bread hosts with three drops of wine on them.
This practice was established in every congregation in 1917 and remains to this day.
While the Holy Communion had originally been celebrated separately with bread and wine, the current practice uses unleavened bread wafers which are manufactured with three drops of wine trickled onto each.

The name Neuapostolische Kirche (New Apostolic Church) came into use in North America as early as 1918.
A variety of names had been used there previously, including German Apostolic Church and Apostolic Church.
This name was uniformly adopted in Germany in the late 1920s as well.

On 25 January 1930, the day before his 25-year anniversary as Chief Apostle, he fell down the stairs in an accident and was pressed to give up his duties.
He remained diligent but was finally retired by the council of apostles on 21 September 1930.
He died on 23 August 1932 at the age of 84 years.

In 1905, Chief Apostle Niehaus oversaw six Apostle Districts with 488 congregations.
At the end of his tenure, there were twelve European Apostle Districts with about 1,600 congregations and further 200 congregations overseas.
The New Apostolic Church in Germany counted 138,000 members in 1925.

The initially deep ecumenical conviction, which was cultivated in the Catholic Apostolic Church and then by Heinrich Geyer, had declined over time due to heavy conflicts with other Christian denominations, perhaps because the theologian education of ministers in the Catholic Apostolic Church may have been lacking (only a few had been Catholic Apostolic ministers before), or there may have been rejection by the national churches.

The lower social classes, from which important ministers were drawn, were essential for the growth of the church.
Nationalistic appeals can be found in hymnaries and theological scriptures from that time.
Also, significantly for that period, the church's structure became increasingly hierarchical.
The most charismatic element of the Catholic Apostolic Church, prophecies, became rarer (the last oral lore dates from the 1980s) and the Prophet Ministry disappeared.
In fact, a total reform of the evangelical pattern can be observed and which became apparent by expelling Catholic Apostolic influences.
In August 1906, Chief Apostle Niehaus ordained Apostle Helper Johann Gottfried Bischoff as District Apostle of the Middle Germany and Württemberg district, replacing the late Apostle Ruff. He also renamed the Neuapostolische Gemeinde (New Apostolic Congregation) as Neuapostolische Kirche (New Apostolic Church) and created a public corporation for it. He ordained numerous young ministers and regularly convened conferences of apostles. He founded the periodical church publication Apostolisches Sonntagsblatt (Apostolic Sunday Paper), later Neuapostolische Rundschau (New Apostolic Review), in 1907 as an additional weekly publication to go along with Der Herold and Wächterstimme von Ephraim (Watchman's Voice of Ephraim). In 1908 he issued the Allgemeinen Hausregeln (General House Rules) and in 1916 he wrote the first textbook about the New Apostolic faith Fragen  &  Antworten (Questions &  Answers). This book still exists in its revised 1992 version, but will be replaced by the new catechism.
As the first of the Chief Apostles, Apostle Niehaus and Apostle Carl August Brückner visited United States congregations on 19 August 19, 1909. The outbreak of war in 1914 brought high exposure to the church. The soldiers at the frontlines were administered the Holy Communion by field post as bread hosts with three drops of wine on them. This practice was established in every congregation in 1917 and remains to this day. While the Holy Communion had originally been celebrated separately with bread and wine, the current practice uses unleavened bread wafers which are manufactured with three drops of wine trickled onto each.
The name Neuapostolische Kirche (New Apostolic Church) came into use in North America as early as 1918. A variety of names had been used there previously, including German Apostolic Church and Apostolic Church. This name was uniformly adopted in Germany in the late 1920s as well.
On 25 January 1930, the day before his 25-year anniversary as Chief Apostle, he fell down the stairs in an accident and was pressed to give up his duties. He remained diligent but was finally retired by the council of apostles on 21 September 1930. He died on 23 August 1932 at the age of 84 years.
In 1905, Chief Apostle Niehaus oversaw six Apostle Districts with 488 congregations. At the end of his tenure, there were twelve European Apostle Districts with about 1,600 congregations and further 200 congregations overseas. The New Apostolic Church in Germany counted 138,000 members in 1925.
The initially deep ecumenical conviction, which was cultivated in the Catholic Apostolic Church and then by Heinrich Geyer, had declined over time due to heavy conflicts with other Christian denominations, perhaps because the theologian education of ministers in the Catholic Apostolic Church may have been lacking (only a few had been Catholic Apostolic ministers before), or there may have been rejection by the national churches.
The lower social classes, from which important ministers were drawn, were essential for the growth of the church. Nationalistic appeals can be found in hymnaries and theological scriptures from that time. Also, significantly for that period, the church's structure became increasingly hierarchical. The most charismatic element of the Catholic Apostolic Church, prophecies, became rarer (the last oral lore dates from the 1980s) and the Prophet Ministry disappeared. In fact, a total reform of the evangelical pattern can be observed and which became apparent by expelling Catholic Apostolic influences.
New Apostolic Church