I think it's very easy to debunk atheism, but that people rarely recognize it because the marketplace of ideas is permeatted with faith-based right-hand path ideology and people have lost sight of logical foundation.
1. Faith can only exist in the absense of conclusive evidence, for if something were proven beyond a doubt then by definition it would be impossible to have faith in it. (It's important to properly identify what a person has faith in, for example one could claim to be certain of god's existence yet also claim to have faith in him, but in this case they would be having faith not in the fact of his existence but in the hope that he will act a certain way.)
2. It's impossible to find conclusive evidence that nothing generally thought to be 'divine' actually exists (indeed many scientific discoveries and theories seem pretty 'far out' themselves), only individual arguments for the existence of the divine can possibly be refutted or confirmed on a case-by-case basis.
3. If a person has no proof in the existence of the divine and therefore chooses to refrain from observing any spiritual or religions views or practices, then by definition they are an agnostic
, not an atheist.
4. If a person refuses to be patiently skeptical regarding claims of the divine and insists that notions of the divine are so outlandish as to be laughably, unequivocaly absurd in all cases, then in other words because they reject the blind, faith-based thinking that one must 'believe', instead they embrace the equally blind, faith-based thinking that one must instead not 'believe'--both conclusions lack logical foundation and therefore must require a leap of faith.
I believe faith-based ways of thinking have become so entrenched into every facet of the marketplace of ideas, into every corner of mainstream society and modern living, that logic has been reduced to a trifle, highly convenient when supporting one's arguments or justifying one's egocentricities (especially to one's self) but otherwise discarded as being only peripherally important in a world otherwise succincly represented by the Nike phrase "just do it".