carolina, I can disagree without being testy about it. I apologize for what has amounted to attack mode at times. I think I can do a better job in trying to achieve a certain context.
Both East and West practice meditation. We often forget that there is a rich tradition of Christian contemplative life and literature. In both East and West, people separate themselves from their greater society to lead contemplative lives. Utilizing spiritual practices to grow closer to what we call God. If you're an atheist, it might be seen as a fool's mission. Might as well be Don Quixote as seek that which doesn't exist. But, men and women of the Christian tradition are compelled into that life. Obviously, it's for the few. Few can do that.
But my point is, yes, yoga is used in spiritual practice. By sincere people being human. Seeking something larger then themselves. No need, no justification, in seeing that as bad. Both greater traditions practice meditation within their monastic schools. People speak of the "perennial wisdom", a commonality of understanding and practice underlying all the major religions. Who knows why some people seek that life? A fool's errand, the culmination of lifetimes of seeking if one believed such a thing, whatever. The point is both East and West utilize spiritual practices in service to their quest. Union with God? Read St. Theresa, or St. John of the Cross. For that matter, read the words of Sufi mystics. Love infuses all their words. St. John of the Cross is noted for coining the term, "the dark night of the soul", denoting a stage on the spiritual path. I think in any given lifetime, a relative very tiny % of humanity engages on such a journey.
Yoga is not dangerous. It has many layers. Of course it can be used strictly within a physical therapy context. One can even buy into the notion of prana, the life force, without becoming a Hindu or a Buddhist. Yoga poses are utilized during meditation. Meditation is not antithetical to Christianity. At all. Quite the contrary. The inner tradition of the faith has meditation and contemplation as the essential practices on the Christian spiritual path. Yoga has been a tool for optimizing the very same states within the Eastern tradition. You can't reduce it to sorcery. You can't demonize it. There really is no need of that.