This is a fascinating thread. I am kind of on the fence here. I'm a Muslim and we don't bow to anyone but the Almighty, so I really have an issue with the namaste/bowing thing - I attended a few weeks of yoga class but had to stop because of an acute health issue. I told her I couldn't bow but I put my hand to my heart when she greeted me - that's a kind of greeting in some Muslim cultures - to show some kind of respect, but in a way that doesn;t go against my religion.
I enjoyed it, and the teacher was a Christian lady - well, I assume she was because she wears a cross around her neck, whilst doing the namaste/bow. She made the point that Yoga isn't about religion, and I also read somewhere that it is something that evolved parallel to Hinduism in India, so it's separate. Although I understand that some forms of Yoga are more spiritual and/or tied into Hindu practice.
I have only done very basic stuff so far, but the teacher did mention the "Sun Salutation" which I had heard of before. I am feeling very conflicted about that, because to me it sounds and looks like worship, with bowing postures etc. As a Muslim I definitely do not want to be bowing to the sun, only to the sun's Creator.
So I'm not sure about going back when the docs clear me for exercise again. I couldn't do half the postures anyways - too fat and unfit
But I liked the relaxation at the end...
I may or may not go back. Will have to work out the philosophical/theological issues in the meantime...