Hi Alan,
Wedekin is not an uncommon name in the Hildesheim area, I have Wedekin in my ancestry as well (but no match to your data, my Wedekin come from a nearby village). The church records are in the Bistumsarchiv in Hildesheim, digitally scanned. For the Holy Cross, they range from 1627-1852. I doubt that these are online anywhere, however. You would have to hire somebody to do the research. I would offer my help, but I don�t know when I find the time, as I�m working full time. However, if you don�t find anybody to help you, and I take the time to research someday, I will help you - but I have no idea just when I will get around to this. I wanted to visit the archive for that purpose for years....
I found a reference to Triepel online: http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bauerschaper&id=I08418 This might be a connection, as Triepel is not a common name. Mail to Mr. Bauerschaper, his mailadress is in the data. Perhaps he knows more.
Stefan