Oh please. My American instructors are all Christian who know little about Hindu stuff. One is a recovering drug addict who plays 70s music during the yoga, and sometimes plays his own songs on guitar. He just says "Namaste" at the end. It's basically a workout. No Hindu gods or demons or whatever are even mentioned.
Does it seem likely that the devil would try to corrupt the body of Christ?
Would you expect his methods to be straightforward, or would you expect them to be subtle?