I found this article looking at the issues of Jebel al Lawz being identified as Mount Sinai. Haven't read the whole article, but in regards to the petroglyphs it points out that, far from being a single occurence, these petroglyphs can be found throughout the region. There is fifty in this region alone, and about 300 such sites throughout north west saudi arabia. The carvings date to the neolithic making them much older than the purported date of the exodus. It also brings up a question. If Moses destroyed the golden calf since it was an idol, as described in the bible, why do these petroglyphs still exist if they are also graven images?