We could argue that the Lord's work is magic, yes, but that's not necessary. The bible clearly indicates that a worldwide flood ravaged the Earth. This we know. However, none of us alive today were witness to the entire event. Maybe your meanders and cross canyons, etc. were formed by more than just the flood. The flood may very well have formed the initial formation of the Grand Canyon, and subsequent assaults of God's wrath carved the remaining portions into existence (such as from meteorites or comets, which are even mentioned in the bible).

Have you also considered the possibility that Satan himself left false "evidence" for foolish pseudo-scientists to dig up and, without proper knowledge of the bible, fall victim to and believe in?