With Putin talking about the orthodox church being holy and using to justify some conservative bullshit, all I can remember was the bolsheviks going around the country proudly declaring that cities were now "officially godless" and redistributing the church's gold amongst the people and using it to pay for electrification projects.
Going of the memories of my parents, in a Soviet affiliated country but not the USSR... the vast majority of practicing priests were agents for the internal police. In general practicing religion was discouraged, outright preaching wasnt a thing, and tabs were kept on people who openly went to church. Schoolchildren would get their behavior score deducted for going to church and school institutions could have a stern talk with parents over it. And of course kids were encouraged to snitch on parents over it.
Sounds good to me