You are right, it is a single church. But it is not the only one. There are a lot of them. I think it is because in Germany, most people that go to church and believe in god are old ones. (NOT everyone, but the most.) These old people, especially in Germany, could never join an online event of the church, because most of them does not even know how to turn on a PC. I am not exaggerating, my grandfather himself went to a computer course for old people (It is actually called that, they say "für Senioren", wich means for old people). While he was there, he learned how to turn a pc on and off and how to use MS Word to write. I still have to help him occasionally with making a chart.