"Yes, I think I use the term radical rather loosely, just for emphasis. If you describe yourself as atheist some people will say, Don't you mean agnostic? I have to reply that I really do mean atheist, I really do not believe that there is a god; in fact, I am convinced that there is not a god (a subtle difference). I see not a shred of evidence to suggest that there is one...etc., etc. It's easier to say that I am a radical atheist, just to signal that I really mean it, have thought about it a great deal and that it's an opinion I hold seriously."

Previous Quote

The agnostic does not simply say, "l do not know." He goes another step, and he says, with great emphasis, that you do not know. He insists that you are trading on the ignorance of others, and on the fear of others. He is not satisfied with saying that you do not know, -- he demonstrates that you do not know, and he drives you from the field of fact -- he drives you from the realm of reason -- he drives you from the light, into the darkness of conjecture -- into the world of dreams and shadows, and he compels you to say, at last, that your faith has no foundation in fact.

— Robert Green Ingersoll