That would be respecting an establishment of religion. Unless the prayer room is open to all students, there is a violation. I suppose it would be OK if they used it at different times, but given the diversity of religous groups present, I doubt that would be practical.
I'll bet there are more Hindus at Berkner than Muslims, and more Buddhists than either.
Doubtful. Berkner is where my kids would go if they weren't homeschooled. Believe it or not the vast majority of Asians and Indians in this area are Christians.