An interesting article from Guardian Unlimited brings forth a letter and some compelling evidence that even Mother Theresa doubted the existence of god.  Now if we could get a few more people to even give that much thought to the matter, the world may be a different place.  Excerpt from the letter:

I call, I cling, I want ... and there is no One to answer ... no One on Whom I can cling ... no, No One. Alone ... Where is my Faith ... even deep down right in there is nothing, but emptiness & darkness ... My God ... how painful is this unknown pain ... I have no Faith ... I dare not utter the words & thoughts that crowd in my heart ... & make me suffer untold agony.

So many unanswered questions live within me afraid to uncover them ... because of the blasphemy ... If there be God ... please forgive me ... When I try to raise my thoughts to Heaven there is such convicting emptiness that those very thoughts return like sharp knives & hurt my very soul. I am told God loves me ... and yet the reality of darkness & coldness & emptiness is so great that nothing touches my soul.

Also, as the article states, "the letters have not been revealed by one of her avowed enemies, like Christopher Hitchens, but by the man who is responsible for promoting her canonisation, the Rev Brian Kolodiejchuk, who has prepared an edition of her letters as part of the evidence that she really was a saint."

 

Doesn't necessarily say that she was an atheist, but it is interesting nonetheless.