Where and how differently (to their Orthodox converted neighbors) did the last old practicing Slavic Pagans live? I came across a few sources stating that up until the 16th century sporadic agrarian communities still worshiped the old Slavic Deities as the Eastern Orthodox Church (in Russia) wasn't capable / interested in enforcing their theology on far away districts / unimportant places, what changed to get the church to actively convert these last communities, or did they die out on their own?
https://www.reddit.com/r/AskHistorians/comments/9ciosn/aside_from_lithuania_were_there_any_pagan/ You might be interested in this thread that I wrote about pagan holdouts in Europe