It’s worth understanding that a lot of this has to do with time horizons. Most ardently religious people have a time horizon that extends literally into infinity. They’re not just thinking about their lives, but what happens after their lives. Even the more “moderate” religious people are thinking about the lives of their progeny and descendants. This mentality produces extremely stable people who are very difficult to shake up. Some atheists do exhibit this, but most do not.
Communists hate people with long time horizons because they are harder to manipulate. If you convince someone that their choices matter, that the devil controls the world, that they must create children and give them good lives, that they are going to be forced to make tough, uncomfortable choices, and that the consequences of caving to bullshit are simultaneously harder to define but also more serious than whatever the devil and his agents can levy against them, how likely do you think that person is to cave to some thinly veiled psyop gaslighting or some blunt coercion like the prospect of job loss? Who is more likely to acquiesce to that, the aforementioned integrity-obsessed man or some coomer hedonist who is convinced everything is a big meme and nothing really matters?
That just isn’t the case. Most successful religions require their members to be fruitful and multiply, and then in turn set up their kids for success in life. So time horizons that extend past the lifetime of congregants is the norm, not the exception.