Your assertion of old hinduism vs. new hinduism is very interesting. From what I understand of so called "old" hindu philosophy, it seems remarkably similar to what I know from Buddhism. Both emphasize the ultimate void - "sunyata" in former, "nirvana" in latter. However, buddhism has the tilt towards "atheistic" flavor (with assertions that soul and god does not exist), I wonder what upanishad's say in this regard.