I think this has happened to every religion, philosophy and belief system extant.
We - Westerners - have developed the habit of picking and choosing what we want from these full-blown systems, and it raises both good and bad points. Good in the sense that we divest ourselves of some of the more occult or folk-lorish beliefs and practices, but bad in the sense that in doing so we blindly discard some very important points.
A system - a religion or belief - really only works when it is a whole. At least in the beginning, you need to "buy-into" the entire package in order to gain the insights that the founders put into place. Without knowing them, you are only miming the movements and words.
I am guilty of this myself in my proclamation of being Taoist. First, I usually need to qualify that I am a philosophical Taoist, not a religious one. I received training in a Western Taoist institution / temple that qualifies me as a lay Taoist minister, able to perform religious functions such as weddings, funerals and holy day celebrations, but it's been many years since I've done so. Still, when I teach my students about Taoist philosophy I can at least give them an insight into how those philosophies came about, and let them decide whether they want to pursue the religious aspects or not.
Here in the West, as AS said, many of these essential points have been corrupted or, worse yet, entirely lost. It becomes a hollow pursuit wherein enlightenment, nirvana or whatever the goal is becomes unattainable.