The legislative history of the 1954 act stated that the hope was to "acknowledge the dependence of our people and our Government upon … the Creator … [and] deny the atheistic and materialistic concept of communism." In signing the bill on June 14, 1954, Flag Day, Eisenhower delighted in the fact that from then on, "millions of our schoolchildren will daily proclaim in every city and town … the dedication of our nation and our people to the Almighty." That the nation, constitutionally speaking, was in fact dedicated to the opposite proposition seemed to escape the President.
Not only that, but the band played "Onward Christian Soldiers" during the ceremony that added those words to the Pledge. So it is naive to say that the words Under God were meant to have anything but Christian connotation.