Is atheism a belief?

[Angrboda]

- People say it's a lack of religion, but many atheists say they are religious (This doesn't mean you)

Wrong. They say that atheism is not a religion, not that you can't be atheist and religious. Some Buddhists are atheists, but they are very religious. It's just like anything else, you can be an atheist and practice other things. Buddhist religious practices aren't about their atheism, they are about their metaphysical and physical beliefs aside from atheism. That's not atheism.