Taijiquan would be fine, if not for the ignorant, pious, hypocritical Christian groups and online forums pushing it as new age spiritualism.
I agree that we need to market it friends and neighbors, and the world, that it is one of the oldest, and finest martial art systems out there today, incorporating principles from most every CMA.
The Martial Arts are about pugilism (that is, they come from societies that were based upon feudal dynasties, warring states, etc), not religion.
Sadly, religious groups use the physical and mental aspects of refining, and balancing one's body as done in Taijiquan and Qigong, for their own selfish ways toward enlightenment, which is nothing more than an altered state of consciousness.
The arrogance of the western mind does not surprise me. They need a little more accepting of their fellow human beings, and learn what it means to learn from history, and not try to twist it into their own ethnocentric closed mindset.
Let's leave Martial Arts as it is meant to be, and as it was. It's only fair to preserve history, and not twist it around for your own selfish religious 'calling'...
Perhaps the more we post what the Martial Arts are really about, the more some will get the clue.
It may not be pretty, and it is primarily physical, but it's not religion.