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There is plenty of evidence that Darwin was in fact an atheist from both his own writings and from those who knew him. A simple google search can provide that.

In regards to his pushing aside the idea of a creator in favor of his own theory, you can read it in "Origins" when he discusses the eye.

To arrive, however, at a just conclusion regarding the
formation of the eye, with all its marvelous yet not absolutely
perfect characters, it is indispensable that the reason should conquer
the imagination; but I have felt the difficulty far too keenly to be
surprised at others hesitating to extend the principle of natural
selection to so startling a length.

In living bodies, variation will
cause the slight alterations, generation will multiply them almost
infinitely, and natural selection will pick out with unerring skill
each improvement. Let this process go on for millions of years; and
during each year on millions of individuals of many kinds; and may
we not believe that a living optical instrument might thus be formed
as superior to one of glass, as the works of the Creator are to
those of man?

Regards,
Boiler Plate

There is plenty of evidence that Darwin was in fact an atheist from both his own writings and from those who knew him. A simple google search can provide that.

Since there appears to be a bit of a problem doing searches, let ME help!

Charles Darwin (1809-1882)
"By further reflecting that the clearest evidence would be requisite to make any sane man believe in the miracles by which Christianity is supported,—and that the more we know of the fixed laws of nature the more incredible do miracles become,—that the men at that time were ignorant and credulous to a degree almost incomprehensible by us,—that the Gospels cannot be proven to have been written simultaneously with the events,—that they differ in many important details, far too important, as it seemed to me to be admitted as the usual inaccuracies of eye witnesses;—by such reflections as these, which I give not as having the least novelty or value, but as they influenced me, I gradually came to disbelieve in Christianity as a divine revelation. The fact that many fake religions have spread over large portions of the earth like wildfire had some weight with me. But I was very unwilling to give up my belief; I feel sure of this, for I can remember often and often inventing day-dreams of old letters between distinguished Romans, and manuscripts being discovered at Pompeii or elsewhere, which confirmed in the most striking manner all that was written in the Gospels. But I found it more and more difficult, with free scope given to my imagination, to invent evidence which would suffice to convince me. Thus disbelief crept over me at a very slow rate, but was at last complete. The rate was so slow that I felt no distress, and have never since doubted even for a single second that my conclusion was correct."
( Charles Darwin in his Autobiography of Charles Darwin, Dover Publications, 1992, p. 62. )

Charles Darwin (1809-1882)
"I think that generally (& more & more as I grow older), but not always, that an agnostic would be the most correct description of my state of mind."
( Quoted from Adrian Desmond and James Moore, Darwin: The Life of a Tormented Evolutionist, New York: W. W. Norton & Company, 1991, p. 636. )