It is difficult logic to assert a null hypothesis. An agnostic has a defensible position. An atheist asserts something that can only be faith based.
Agnostics I have known are mired in honest doubt and usually say they would believe in God “if I had more proof”.
They lack the angry dogmatism of the determined atheist, you know, the one who mocks believers’ Deity as “skydaddy” or “your imaginary friend”.