Although I myself am quite the atheist, I have to admit that I am sometimes fascinated by religious imagery. This really struck me though, as a testament to mass human reliance on a thing like religion. A flood, almost.
The cross used as a symbol of someone's personal belief, this structure represents an almost over-saturated view of Christianity. It almost gives a lost, desperate sense to what it is supposed to represent, and reminds me in a way of something post-apocalyptic - when there is nothing left, what else is there to do but put thousands of crosses on an ordinary mound and hope for the best.