Atheism, in its most general definition, is the absence of belief in gods or deities. Atheists lack belief in gods, meaning they do not hold a belief that gods exist. It's important to note that atheism is not a positive assertion that gods do not exist; rather, it is a lack of belief in their existence due to a lack of convincing evidence or reasons.
Some atheists may actively reject the belief in gods based on their understanding of the world and the lack of empirical evidence supporting the existence of deities. However, atheism, in its fundamental definition, is simply the absence of belief in gods, and individuals within the atheist category can hold a range of beliefs and attitudes toward religion and spirituality. Some may be very vocal about their atheism and actively promote secularism and skepticism, while others may adopt a more passive or private stance regarding their lack of belief.