The Pew study is either intentionally misleading, or horribly naive. The number of congresscritters that claim adherence to Christianity is a political lie. Many claim being religious as a tactic to get elected. Country's leaders from Roman times lied to the great unwashed ignorant religious masses in order to control them. A nations agnostic or atheist super rich control the politicians who most often think just like their owners. The great mass of religious voters are ignorant dupes.