At one time, I was able to access marriage records of Frederick W. Meendsen, who served as pastor of the Towamensing church and others, online. The link has disappeared. However, some of his records are available at the Pennsylvania German Society Cultural Heritage Center in Kutztown (info at http://www.kutztown.edu/community/pgchc/index1.htm). Click on Library, then Collections, then Pastoral Records to see a list of their holdings. Looks like the Meendsen records they have only cover the period 1809-1831.

Good luck!