Yogas With or Without Knowledge
I don't think that emptiness teaching is or was meant to start a new religion that we now know as buddhism. I think it was meant to fix the central problem in hinduism but then things went otherwise and a new religion was developed. It is a whole another discussion how is it possibe that there is so many basic misconceptions and misunderstandings in hinduism, considering that jnana yoga is one of the most basic forms of hindu yogas. There cannot be any other knowledge or jnana than knowledge of one's true nature. All other jnanas come far second and yet, it is these secondary knowledges that most hindu practitioners spend their lives with, left ignorant of one's true nature. That is a tragedy.
The way I see it is that both self-delusion and its removal through the teaching of shunyata are both universal. We have to reset the karmic counter back to zero (shunya) to be able to have the primary knowledge of our existence. However, considering that this teaching isn't available to that many people and it comes together with the religious packaging of buddhism, so people associate the teaching of emptiness with buddhism, Asia and so on, are signs that many things went wrong along the way for various reasons. If we look at great founders like Jesus and Buddha, I think what they meant to do was to offer and bring medicine for the humanity, not start their own groups for the sake of having a group. Although I feel that I'm a buddhist, often when looking at what goes on in buddhism, I feel like a complete stranger to it. It is just what Babaji told me years ago, that there is no this or that yoga, you could say no this or that religion. There is only that which works and that which doesn't in terms of existential confusion. People get so confused when faith and belief come into the picture and loose sight of what is truly important. To me there cannot be other type of dharma than dharma that releases dualistic (plus or minus) confusion into zero. And this was always the real meaning of yoga.