Dietrich has dedicated his life to planting churches in Germany, having planted five churches within the Evangelical Free Church of Germany in the cities of Kriftel, Oberursel, Mannheim, Kaiserslautern, and Ramstein. In 2008 Dietrich was appointed the executive director of church planting for the Evangelical Free Church of Germany (Bund freier evangelischer Gemeinden, Witten). Under his leadership the denomination is seeking to plant 100 new churches in Germany in ten years.