Molokans (Молокане) - the bygone civilization in Russian history

[Ülev]

A Molokan (Russian: молокан, IPA: [məlɐˈkan] or молоканин, "dairy-eater") is a member of various Spiritual Christian sects that evolved from Eastern Christianity in the East Slavic lands. Their traditions—especially dairy consumption during Christian fasts—did not conform to those of the Russian Orthodox Church, and they were regarded as heretics (sektanty). The term Molokan is an exonym used by their Orthodox neighbors; they tend to identify themselves as Spiritual Christians (духовные христиане : dukhovnye khristiane).

https://en.wikipedia.org/wiki/Molokan

[Ülev]

and in Russian language

[Ülev]

Molokans in Armenia

[PaleoEuropean]

I am pretty sure they have a tiny community in America, I think they moved mostly to Mexico though. I know some later assimilated into American society and became baptists etc.