Family #39 in the 1767 Grimm census.
Family #117 in the 1775 Grimm census.
Family #114 in the 1798 Grimm census.
Nikolaus Muth was born about 1724 in the Isenburg area of what is now Germany. Born to a Lutheran family, he became a farmer. He married Charlotta on 10 January 1747 and the couple had two children, Alexander, born 1747, and Susanna born about 1748.
Nikolaus decided to immigrate to Russia, taking with him his wife and two children. They arrived in Russia on 10 August 1766 on the Russian Pink Vologda under the command of Lt. Sergey Bartenyev.  There were no Muths in the Volga German Transportation List,  so it's not clear if everyone survived the hard winter in Oranienbaum and journey to the Volga region. What is clear, however, is that by 1767, when Nikolaus was listed in the Grimm census, his wife Charlotta had not survived. He had remarried a woman named Elisabeth. Additionally, his only daughter is named Elisabeth, not Susanna, and is 21 years old, not 18 or 19. It's possible that her full name was Susanna Elisabeth, but her age was probably also in error. If she was 21 when she immigrated to Russia, she would have been 22 one year later after she settled in Grimm. If she was 17 in 1767, as the census suggests, she would have been 16 when she first immigrated to Russia. There is a chance that Nikolaus' daughter Susanna had married and was living in another family, and that Elisabeth in the 1767 census was actually his step-daughter, daughter of his wife Elisabeth. At this point, historically, census takers usually identified step-children and orphans, along with their birth names.
1767 Grimm Census 
1775 Grimm Census 
1798 Grimm Census 
In 1798, he was living with his son's family, even after the death of his son Alexander. His wife Second Elisabeth is not mentioned, so she had presumably already passed away.
Some records show he married Charlotta Kühnemann. The dates are in sync with the Nikolaus Muth of this profile, but this record shows that he and his first wife were Catholic. Grimm records show that he was Lutheran. It is possible that he embraced another denomination once in Russia, as at least one other Grimm family did, but that kind of thing happened with less frequency.
10 Jan 1747 • Hellstein, Main-Kinzig-Kreis, Hessen, Germany Gelnhausen Catholic Church Records - On January 10th Niclaus Müth, a musketeer with the Sovereign of Waldeck’s Regiment, legitimate son of the late Velten [Valentin] Muth, and Charlotta, legitimate daughter of Daniel Kühnemann from same place were married.
Charlotta Eleanora Kühnemann
Later on, in the birth record for one of their children, it shows he was baptized in the Lutheran church. He was the son of Nicolaus Muth and Charlotta Eleanora Kühnemann, so the record is for the same couple.
Maybe one of the couple was Catholic and the other was not?
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.
Nikolaus is 40 degrees from Vlad III of Wallachia, 30 degrees from John Carradine, 29 degrees from Lon Chaney, 34 degrees from Rutger Hauer, 33 degrees from Gloria Holden, 32 degrees from Christopher Lee, 29 degrees from Bela Lugosi, 33 degrees from Leslie Nielsen, 32 degrees from David Niven and 34 degrees from Margaret Allison on our single family tree. Login to find your connection.