Not for the purposes you are flogging here.
They don't believe in a supernatural god, possibly, hard to say on an individual basis, but I'll allow that. In that small, simple way, yes they are 'atheists', except that's not how you're using it.
You're using it as an example how 'atheists' treat religious people. In this context, we should not consider them 'atheists'. They have substituted a political ideology (communism, and it's historical intolerance of religion) for a religious, or even a secular state.
It's why you are limited to just china for this purpose. There are other secular (atheist) states that don't work for this purpose, because they aren't aggressively hostile to religion, because they lack the Communist (subset/version 2.0 Soviet) ideology.
It's not atheism because it's not a lack of religion. It's a political ideology wedged into the space where a religious theocracy would normally occupy. You don't talk about Sweden in this context because the people are secular/atheist, but religion is well tolerated, because it has not been replaced by communism.
If Sweden was politically communist, you could then use it as an example of continuous religious oppression, because the conflict is borne by communism, not atheism.
Hell, Sweden still has an official state church. It's not an issue for them, because they aren't communists.
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