Now as to the question "Is Photography Art?"
I think intention may play a large role in this. Do you take photographs to document/record/report pictures of a place/person/event/animal, etc?
Or do you look for a different angle/aspect/possibility so that the image produced is something in addition to a record? I think this would apply both pre- and post - photographing the image.
In other words are you "trying" to produce a photograph in an "artistic" way?
There is no doubt in my mind that there are many photographs which I would class as art and in fact a friend of mine regularly exhibits his photos along with conventional artists' work, and they do not seem out of place. (I wish he would try putting them on to canvas - which can be done now - and I love that look).
There are many, many photographs on POE which I would class as "Art Photos".
Art is defined by each of us in a different way, and seen by each of us differently. Not all "art" appeals to everyone, and in fact some "art" can be quite a "turn-off" for some. I think Art, like beauty, is in the eye of the beholder!