I'm sorry but no I do not know the church that the Kratz family belong.I have been researching the Keppers and I have just begun to look at the Kratz family.
What I know is that Catherina Kratz was born in 1843 in the Hesse-Darmstadt area of Germany.
She immigrated to the U.S. alone when she was 18, arriving in Baltimore from Bremen on the Admiral on 14 June 1860. No other Kratz names were on the ship.She later married Bernhardt Kepper.In the 1870 Federal census, it lists the people I sent to you earlier.
Catherine died on 5 December 1885 of cancer.She is buried in Mt. Carmel cemetary but no religion is ever mentioned.Her parents names are never listed either.We are not even sure if Margaret Kratz was her mother or aunt.
It does seem more than a coincidence though that there seems to be a John Ulrich and a John Kratz affiliated with them in 1870 and they are bakers.Maybe we do have cross-lines.Let me know if you discover anything.