There really are no forced religions in Europe either, though it is certainly true that from its founding, the United States has made more of a commitment to religious freedom, which has in many ways translated into religious fervor. I would say that almost everyone I know (outside of academic circles) is a believer, and most are practicing Christians. This is true of all ages, including young people. However, I know and communicate regularly with dozens of English people, and many are openly religious. I think much depends on where you live.