And as an Indian who used to practice Yoga as a child (too boring for me now) I'd say that this is completely fine. If the theological aspect was indeed crucial for deriving value from the whole experience, people would eventually lose interest because they wouldn't be gaining anything from the aliabramovitz's venture right?
Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?[1]
[1] Quote by Douglas Adams