Islam should be connected to Judaism (and Christianity, I guess).
Surprising that Hinduism is so young, I thought.
The distinction is drawn between "Hinduism" in its earliest stages and the "more mature" modern faith. That is, there was a religion with many of the same gods as Hinduism much, much earlier than this chart suggests, but it had none of the concepts of divine unity that latter-day Hinduism expresses. This coincided, not without reason, with the appearance of Buddhism and its challenge to "pre-Hinduism" to offer a more coherent message.
