Within the US, which is they only context I can reference with any depth of personal experience, it's hard for me to answer the question of how many Hindus practice yoga.

I do not see many Indians in yoga classes. Further, it's not always easy for me to tell which Indians are Hindu and which are Christian or Muslim unless there's some conspicuous symbol -- a hijab, names like Muhammad or Ganesh, certain kinds of tilak, or a cross worn around the neck. There is a very large Indian immigrant community in my area, but it has its own institutions and activities. These folks don't tend to move outside their own community, and the community is not terribly welcoming to non-Indians. I know that the local Satsang center has yoga classes, but I have no idea how many people are participating. Finally, I know a number of westerners in my yoga classes who follow Hindu practices and spiritual beliefs in ways that make them Hindu in everything other than family origin.

You can find a number essays on the question of "Who is a Hindu?" Vivekananda, for example, has one that is well known.  Most commentators (at least, most that I have read) come to the conclusion that a Hindu is defined by beliefs rather than exclusively by having been born to a Hindu family.  From this, I think that we can take the western versus Indian issue out of the discussion of so-called "christian yoga".

It is clear that the essential beliefs of Christianity are not compatible with the essential beliefs of Hinduism, owing to things like the unique and authoritian nature of the Christian deity, karma/reincarnation, and the question of Biblical versus Vedic scriptural authority (this in itself is a long discussion, and we have another thread on it in this forum).

Yoga in its more general sense (i.e., not just doing asanas) is an essential element in Hindu belief, but it's only a part of Hindu belief. Therefore, one who practices yoga is not necessarily a Hindu.

The goal of yoga, which is to move toward the Divine, is in its simplest form compatible with Christianity. However, no Christian would agree that salvation could be achieved through Karma yoga alone, nor through Raja yoga, nor through Jnana yoga... Bhakti yoga (the yoga of devotion) would come closest to Christian thinking, I think, provided that the practice included acceptance of Jesus Christ as one's personal savior and the rejection of all other gods.

To make any sense of the question of whether one can have a "christian yoga", we really need to start with a definition of yoga. That definition could then be balanced against christian tenets. It could also be balanced against the forms of yoga described in ancient Indian scriptures, such as the Bhagavad Gita or the Yoga Sutra of Patanjali.  We would be seeking to determine whether this definition of yoga were consistent with both.

My sense is that people on both sides of the question are using fuzzy definitions of both yoga and the two belief systems; in fact, I'm not certain that any of the three can be defined with sufficient precision to answer the question.

What do y'all think?

... bg

 Evangelism can be so tiresome....

 ... bg