Basically it lacks everything which is not a part of some "mainstream" religion today, for which it has, conversely, very impressive list of local (sometimes even hardly distinguishable) denominations. I cannot find any animistic religions, no shamanism, virtually no polytheistic religions outside of hinduism.
But it isn't really because the map isn't "complete enough", I'd say the whole taxonomy is a bit weird. It makes it look like there were several "major" religions like "Chinese folk Taoism" and "Japanese Mythology" which produced everything else, when if fact they are not "major" at all: it would be more accurate to start from general spiritual cults, where every concrete local religion would be thin line as well. Of course it wouldn't look like real tree, and it shouldn't.
But it isn't really because the map isn't "complete enough", I'd say the whole taxonomy is a bit weird. It makes it look like there were several "major" religions like "Chinese folk Taoism" and "Japanese Mythology" which produced everything else, when if fact they are not "major" at all: it would be more accurate to start from general spiritual cults, where every concrete local religion would be thin line as well. Of course it wouldn't look like real tree, and it shouldn't.
Wikipedia, as always can provide somewhat decent insight: http://en.wikipedia.org/wiki/Timeline_of_religion