Christian apologist, Tyler Vela, has observed that atheists like to define “atheism” and “belief” in very nontraditional ways, and these definitions lead to an absurdity. Consider the following: “Atheist” is redefined as someone who merely lacks the belief that God exists (rather than someone who believes God does not exist), and “belief” is redefined as holding something to be true without evidence (rather than a mental disposition concerning the truth of some proposition). Given these definitions, if God did something by which all people had direct and incontrovertible evidence that He existed, then no one could believe in God (since His existence is no longer an opinion without evidence). If no one believes in God because they know God exists, then they are atheists (because atheists lack a belief in God’s existence). Ironically, then, everyone would be an atheist precisely because they know God exists.

When something ends that badly, you know you’ve gone wrong somewhere. In this case, what’s wrong is the redefinitions of “atheist” and “belief.” Clearly, defining these words in these ways leads to absurdity, and for that reason, these redefinitions should be abandoned.

For further reading:

What exactly does it mean to be an “atheist”?
The New Definition of Atheism is Compatible with God’s Existence
Atheists may lack belief in God, but they do not lack beliefs about God