As I have observed,in many US temples, American whites come for seeking the knowledge,they are interested to become Hindus. Infact they are practicing Yoga, vegetarianism and Sanskrit Slokas. I wonderd in one place in Texas, they respected me so much since I was wearing kunkum on fore head thinking that am a Yogi! Even our own IT guys who were non-visitors to Temples while in India, have become regular visitors here!! thats a great turnout of new generation. As you said, Hinduism is Growing rapidly in USA.