The Pew Forum recently released a study on the religiosity of American teenagers, see here.
Not surprisingly, most teenagers report having the same religious affiliation as their parents, but there is some variation across denominations. Children of evangelical Protestant and Roman Catholic parents are much more likely to share their parents' affiliation than children of mainline Protestant parents. Children of unaffiliated parents are also very likely to be unaffiliated. The church attendance of children also matches that of their parents. When asked about religious beliefs and values, more differences are found.
These findings are not too surprising as we that understand many parents will make the religious affiliation and attendance decisions for their children. Yet they still do provide insight into the religious landscape.