Frankly, I don't get it. Not sure what they are accomplishing or what the point of it is. All by itself, there's not even really a reason to stop and see it as if it was part of a larger attraction (e.g. the one in Eureka Springs at the Great Passion Play).
I've driven by several of these "giant crosses" at various times, such as the ones in Texas and New Mexico, and never stopped and had no desire to. Other than something to see as you drove by, they seemed pointless to me. And there's plenty to see on 65 that it really didn't need this.
And from the "Christian Pastor" perspective, this will do absolutely nothing to "grow the faith" or convince people of much of anything they don't already feel or believe either anymore than beating them with a stick would.
*shrug* really seems like a waste of a lot of money to me.