How is the address of the noble verse: "To you be your religion, and to me my religion" to atheists, even though they have no religion?

First, Surat al-Kafirun was revealed concerning the disbelievers of Quraysh. However, the lesson lies in the generality of the wording, not the specificity of the cause. Thus, the discourse in the Surah is general, clarifying the separation from every religion that opposes Islam.

Second, the word "religion" encompasses everything a person adheres to and believes in, including a method, school of thought, and creed. So, an atheist has a religion, which is atheism, because they follow a method they believe in for life. Anyone who adopts a path they are content with for themselves, that is their religion in a general sense.

Third, atheists have a religion, which is the doctrine and philosophy they have chosen, and they have a reference to which they resort. Whoever does not worship Allah the Almighty is a servant of Satan and whims. Therefore, the Surah is a general declaration of disavowal from the disbelievers and their disbelief, and from atheism, and that the Muslim turns solely to Allah.