Hi Ann,
Each of those entries should be a reference to an actual entry in a churchbook. I clicked on the first link you shared. It looks like there is a related image of the relevant page in the churchbook, but it can only be viewed in a FS Center. (I'm not currently in one, so I can't help you there. But surely someone else can.) Their actual marriage entry likely contains more information, such as the name of their parents and perhaps professions. Some contain birthdates. It'll depend on the format and the pastor who was making the record.
From the FS catalog, I can see that Garczegorze, Lębork, Pomorskie, Polen was known as Garzigar, Lauenburg in Pommern and was part of Prussia. (There are other Lauenburgs, including one near Lübeck which is not the same.)
FS indicates that they have just one collection of church records from Garzigar -- Protestant church records 1728-1874. I see five available image-sets with searchable indexes. I'd assume these are the sources for the Sawusch records.
One note: I can see on Catharina Elisabeth Hauschulz's page that you've noted the large time frame between her marriage in 1816 and the first(?) baptism record in 1829. Looking at Garzigar, you can see the first image-set records baptisms (Taufen) for the years 1765-1791, 1825-1851, 1835-1861. There's a gap in the filmed baptism records between 1791 and 1825. So, that may explain your potential missing Hauschulz/Sawusch children.
