Hello Carola,
for the Rheinland you should try this link
http://www.archive.nrw.de/index.asp
unfortunately it in German
then pick at <Adressverzeichniss>
then pick at <Verzeichnis der Archive in Deutschland>
there you will obtain all relevant adresses of archives in Germany.
The most parishes are on microfilm filmed by the LDS.
The filmes are restricted for Germany but not for you.
Best Regards
Michael Herrfert
----- Original Nachricht ----