Is Geography generally considered an 'art subject' or a 'science one'?
It depends at which level really. At degree level you can obviously do BA Bsc which answers the questions to an extent. It can be either depending on the modules/topics you are taught.
It's a humanity, like history and theology.
But, I'd say it's MUCH more scientific than any of the other humanities.
As I said in the other thread there are two strands to geography
Human Geography which is an art of the same ilk as politics/sociology
Physical Geography which is a science
A-Level Geography is considered a Science by virtually all universities. For those who have not studied it, it involves absolutely no colouring in, maps, or names of countries captial cities (at least my A-Level didn't). To demonstrate the difficultly, two people in my year got C's in geography but got higher grades in Physics and Maths.