The history of the Muslims of Siberia and far East during the civil war is not thoroughly investigated. Meanwhile, the processes are interesting, and trend-defining. They are important for understanding what happened in the subsequent Soviet decades. Religion during the war of-ten performed the criterion of ethnic and linguistic identity. This was reflected in naming units (for example – Muslim company, Muslim council, Muslim orphanage). There were few Muslim units of RCP (b) and RKCY where the formation of Soviet personnel managers was on the way. Thus, the ‘Muslims’ marker not only played the role of konfessionism. One could observe a preserved ‘floating’ ethnicity: some siberians defined themselves according to tukhum names, and only then as the Tatars (Bukharians, Bashkirs, Kazakhs), but, in the view of the believers and others – as ‘Muslims’ always.