After a lot of thought and some opinions from other researchers, I've decided to add the information I found on Johann Georg Walker and Maria Anna Bertsche (aka George Walker and Mary Ann Bertseh) to my family tree. But before I actually jump in and do that I'm going to gather as much information about their siblings and parents, grandparents etc. as I possibly can. Why you might ask, especially if it turns out to be wrong and I end up removing it. Because IF it does turn out to be the wrong family (which it still might down the road) I want to be able to post the information on the genealogy message boards so that the right family can find it.
The one place that stands out in the research I've done so far has been Schlaitdorf, Germany. That doesn't seem to change except for the occasional marriage record where the couple is married where the bride was born. The FamilySearch pilot site is about the only place I've found information, I haven't found the right trees at Rootsweb, but then again I have never come across another tree there with Gentzen in it either.
I feel reasonably confident that Johann Georg Walker is my George Walker and I feel equally as confident that Maria Anna Bertsche is Mary Ann Bertseh (or Pearce if you like). So if you come across information in your research that is similar to what you know but not EXACT, don't write it off as wrong. Look between the lines and see if it is possible that you could actually be on the right track, because in the end you might be.