I agree with the essence of what you said. Like said, the occult is still being produced. I think The Kybalion is an incredibly good book, but it's not perfect. What is being described there is the same thing that is described in Levi's Dogma and Ritual of High Magic, and also in Boehme's three principles. It can be beautifully integrated with the Kabbalah, and can be seen as almost symmetrical to Jung's corpus, but...
But it left the door open for the worst kinds of quantum woo quackery. People like Amid Goswami and all kinds of New Age gurus abused the "vibration" terminology, and dirtied it horrendously.
I think the seven principles stated in it are bang-on, but other commentaries, such as the invalidity of theology and metaphysics, are bullshit. The sensationalism surrounding the work is also questionable. The writer, W. W. Atkinson, was heavily influenced by the new-Thought movement. This clouded his judgment largely, but while that is an error on his part it doesn't undo his merits. The way he described God is perhaps the best way one could ever describe It, for example.
With regards to religion, I think most big religions are valid but one must seek deeply in order to find something worthy, and this is particularly true of Christianity. The Buddhist works, as well as the Islamic and Vedic ones, are good sources of spirituality if you go after the inner metaphysical core.
The issue with Christianity is... that it's dying. Or rather, that it's being hidden, attacked and deformed. It's being swalloed by other movements, transformed into other things, and the symbols are becoming hollow. The Christian God has truly died, even though the Jewish one has not. Christianity is not yet dead, but it's moribund, and this incredibly sad, because it is the most warm-hearted of traditions, and the one with the most symbolically rich central figure -- Christ. And like the central figure was attacked, so is the religion. Catholicism is a shadow, a less than true form. Rosicrucianism is being turned into an empty shell, and Freemasonry has turned into a social club.
Every Christian must, as if own his own, discover and unveil the symbolism of Christ and the Cross by himself. Christianity -- true Christianity -- nowadays involves the task of FINDING the religion, and THEN learning from it. There is no institution out there that helps the seekers find it, not sincerely. There is no good source of Christianity. It has become the individual's task.