Sure, it’s what you make it.
But why should pastors keep the religious identity of yoga hidden from their church members?
It’s the 21st century, nobody is keeping anything hidden. The real question is why should pastors perpetuate ignorance and not bother to see what’s going on in the class. And maybe they should bother to trust their own parishioners, if they say they aren’t worshiping Hindus then they aren’t.