Genealogists in the Unterfranken area of Bavaria

I am looking for a genealogist who could do some searching for me in the
town of Obersinn, Unterfranken, Bavaria I know that my g-g-father, Heinrich
Schubert) came to the USA (VSA) in June of 1850. Heinrich was born (gbr) 17
March 1831. Family oral history leads me to believe Heinrich was Roman
Catholic. He died Feb. 23, 1885 after falling ill while driving his children
to be christened at the RC church in Edina, MO. He married Margaret Miller
(Müller ?), born 24 June, 1843 in Darmstadt, Hessen, Germany. They were
married 23 Feb, 1859 (probably in Schuyler Co., MO. I would like to have
copies of Heinrich’s baptism and or christening registry from the local
(Obersinn) Roman Catholic church. All help is greatly appreciated. Thanks,
(Danke) Kerald Yearns