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"Furthermore, the system is designed to develop control of the spirit, mind, emotions, and body" - and in those few words you describe exactly why Christians have a problem accepting yoga.
The Bible is the standard on how Christians are to discern what and what isn't acceptable. Yoga is not compatible with Christianity.
The only incompatibility between Christianity and yoga is on the mind of the ignorant. Nothing in the Bible even mentions yoga, muchless condemn it as "evil".
Sorry, if that is your answer you really don't understand yoga (pantheism), or Christianity (theism). Yoga in philosophy and practise is incompatible with each other. There is nothing called yoga without the spiritual beliefs that are behind yoga.
It is simply adhering to what Scripture says about certain practices. That is what Christians are to use as the standard. Your answer is based on emotional reasoning.
How do you know that they are not really Christians? Once you study the origins of yoga, or ask a guru on the matter, it is easy to discern that it is not compatible for someone who adheres to Biblical standard.