A theory discussed on the subreddit that redheads are more likely to convert to Islam than people with other hair colors, with various attempted explanations ranging from feelings of ostracism to the Prophet's alleged preference for red hair.
"There is a somewhat common observation that redheads are more likely to convert (or "revert," in popular parlance) to Islam compared to White people with other hair colors. This observation is not unique to r/redscarepod. Some have tried to explain the phenomenon: Ginger Jihadis: Why Redheads are At"