Most of the people in these figures will be Protestant, with a fraction Jewish and Muslim.

http://www.independent.co.uk/news/world/americas/200000-children-married-us-15-years-child-marriage-child-brides-new-jersey-chris-christie-a7830266.html

As in Afghanistan, it's a different problem from that of Catholicism. Sunni Islam and fundie Protestantism don't have institutions run by large franchises answerable to the CEO, like the Catholic religious orders. There is no central authority you can point to and accuse of legitimizing the abuse. (There is in Hasidic Judaism, but that's on a rather smaller scale, and somewhat fragmented). So it really does come down to blaming individuals and the culture they've absorbed.