Online: can't say, haven't had much interaction, oddly enough.
IRL: the most notable is my former boss, a Tatar national and a proud Muslim. His faith mainly came up during various company celebrations (because he doesn't drink), while his nationality occasionally came up when he complained how "all Russians are lazy and don't want to work".
And that's about it. Despite my city having a Muslim population large enough to block roads during religious holidays, personal interactions for me are quite limited.