Europeana is a European online database showcasing the history and culture of Europe. The site was scheduled to debut around Thanksgiving Day, but when I went to the site it was down due to too much traffic. The site was redesigned to handle more internet traffic and the beta version is now partially running.
I went to the site to see what it was all about. There is still some work to be done as the beta version isn't fully complete yet. This seems to involve mainly icons and such.
I did a search for the quintessential German, Martin Luther. There was lots of stuff about him but I did not have time to go into great depth. I did notice some links to his Small Catechism.
Originally, when I saw a clip about Europeana on DW-TV it was stated that the German culture was not as much as other countries. I think France had the most data at that time a month ago.
I do like the fact that you have options of language. So you can choose Norwegian and search for Luther. I tried that and found some data hits. Not sure how much you will find in English regarding Luther and the Lutheran Church, but I hope the website can showcase a good deal of European history, culture, and religion.