Joseph Dan claims that kabbalah transformed from a uniquely Jewish religious tradition into a European concept, “integrated with Christian theology, philosophy, science and magic, at the end of the fifteenth century.”
He stresses that there is no unanimity about the definition of the term “kabbalah,” that it is used differently, to refer to different things, by Christian cabalists, Jewish orthodox thinkers and others. “The confusion is increased by the fact that there is no unanimity in the usage of the term either within Judaism or outside of it, so that various, different and conflicting conceptions of what the kabbalah is prevail in both cultures.”
–Joseph Dan, Kabbalah: A Very Short Introduction, pg. 61.