"So, if you are an atheist looking at Mt. Rushmore, you must presume that the Presidents faces appeared as a result of purely natural causes"
The one difference being, that at least an artistic stone carver existed:
http://en.wikipedia.org/wiki/Mount_Rushmore
(emphasis added):
'Mount Rushmore National Memorial is a sculpture carved into the granite face of Mount Rushmore near Keystone, South Dakota, in the United States. Sculpted by Gutzon Borglum and later by his son Lincoln Borglum'
And what they carved. Not exactly examples of what is known as 'Pareidolia':
http://en.wikipedia.org/wiki/Pareidolia
More popularly known as 'Simulacra' in the magazine "Fortean Times" (with reader-submitted photos of what appears to be 'human'-like faces found in nature:
http://www.forteantimes.com/community/photos/1146/simulacra.html
But then the human mind - especially with it's powerful imagination - will see what it wants to see. But at least our perception of such is tempered by the fact that what we see - especially in solid, physical form - is pure coincidence.
Now, have you, VladK, seen your 'God' (especially taking into account the fact that, whilst a rainbow doesn't actually physically exist, but at least it can be seen), thus say without fear of contradiction that he definitely exists? Now that's an extremely tough question that a Christian daren't ask, never mind answer. One that we Atheists have an extremely simple answer for.
Now care to ask yourself that question, VladK...?
"I think Atheism too has it's questions."
Yes we have, thanks for asking:
1- How much more is there to know about the universe we live in? How many more mysteries can we solve, thus making the previously unknown, known? (on the basis of saying 'I don't know' is the beginning of wisdom). How many gaps are there left that science can fill, thus, in the process, destroying religion?
2- How can anyone 'believe' in something that they can't prove exists? (certainly to the satisfaction of we Atheists)