My great g-father, Heinrich Joerdens, was born in Grunenplan in 1811 and I received copies of his baptism record and his confirmation record from the parish secretary. I will send you the address but you need to understand that the secretary will write to you in German. It would be best if you write to the secretary in German as well. A machine translator such as Bablefish might do well enough. the address is:
Kirchengemeinde Greunenplan
Kirchweg 1
Greunenplan, Germany 31073
with attention to the: Pharramtssekretaerin, Gsell.
Good hunting, Kerald Yearns