Perhaps this question can be answered by considering another issue such as whether Yoda belongs to George Lukas only. He is the one who wrote the character and also brought the Star War trilogy into the concept. But that is not the origin of Yoda. It originated from other realms. However, it can be said that he channeled Yoda and the force from a pure and high source. The teachings of Yoda are found in some doctrines of the past such as Taoism and Samurai wisdom. Now it is easy to understand the above question about Kabbalah.
Let’s look at Kabbalah and Judaism. Jews drafted Kabbalah, and many of the scholars maintained its secrecy despite a lot of objection from the mainstream religion. Though Jews perpetrated the teachings, its origin is transcended to time, nationality and space. It has one root. Regarding spirituality, it does not discriminate people according to religion or their background. For instance, one cannot say that yoga is only for Indians or Christ is only for Christian and so Taoism is not only for Chinese. Taking mental note into the past, during the golden age there was the interaction between Christians, Muslims and the Jews. As a result of that interaction, they interchanged their ideas and cultures, and every group found something beneficial to derive from one another.
Look at how Science grew rapidly as well as philosophy. Soon these disciplines spread to every part of the world. It is an open society, and that is why people can now benefit from the spiritual truths without discrimination. A good example is Pico Della Mirandola who tried to interpret Kabbalah using Christian symbols although he had no much understanding about Kabbalah. There began a Christian Kabbalah called Cabala. During the renaissance in Europe many people tried to understand and interpret Kabbalah, but with little success, because to understand it, you should learn from the teachers who have the wisdom. In England for example, Francis Bacon studied and mastered Cabala and did everything to spread it across Europe. Look at the work of tenets of the Free Masons. They built their temples according to the Blue print of King Solomon of Jerusalem. Therefore, despite its origin, Kabbalah is universal, and everyone in the world can study it.