I can say this, though: Bob Marley never back-combed his hot-lines to God. - Maa Das
As for the spiritual aspects of locks, I wasn't just assuming that. I've done quite a bit of research both in academic and personal contexts, and I feel quite comfortable making the assertion that locks in the vast majority of cases have been a spiritually-related phenomenon. I don't doubt that throughout the course of all human history that there have been people whose hair matted simply in response to environmental stessors, but in general dreadlocks don't just appear. Even without the benefit of scissors or combs, full-fledged dreads are pretty easy to prevent with your hands. However, most of the "primitive" people throughout time (including the present) have been far more sophisiticated than modern Westerners give credit, and some form of scissors and combs have been around for a very long time. For instance, if you examine the story of Samson in the Hebrew testament, you'll find that Samson was under an oath called the Nazirite vow, which included not cutting his hair. Now, a description of the Nazirite vow occurs in Leviticus 6:1-21, which is at least 3000 years old, so we can safely assume that incidental dreads have been avoidable for at least that long. In the Rg Veda 10.136 (the oldest Hindu text), which is at least 3500 years old, we find the Hymn to the Keshin, or "Long-haired Ascetic;" if the members of the ancient society that produced the Rg Veda had no choice about cutting their hair, that "long-haired" bit would be completely redundant, so we can also assume that hair cutting is a still-older tradition. Granted, that leaves another 46, 500 to 96, 500 years to account for in the history of modern humans, but existing religious texts are not the only possible source of information here. We can look at those cave paintings I mentioned in my original post: it seems very suggestive that the figures who appear to have dreadlocks in these paintings are a) few and far between and b) in illustrations that appear to have some sort of magical import. Taking all of this into account, as well as archaeological evidence of combs and the ethnographic information collected throughout written history, but especially since the 19th century, from contemporary "primitive" societies, we can make a fairly strong assertion that matted locks have been an intentional, religion/spirituality-related phenomenon in all human societies up until the 1970's or 80's CE.
Now, as for preaching, I simply sought to bring the light of truth to the general discussion going on in this group. It seems to me something must be wrong if the truth offends. - maa das