"On the evening of D-Day, President Roosevelt led a radio audience estimated at 100,000,000 in a prayer of his own composing:"
"Our sons, pride of our nation, this day have set upon a mighty endeavor... Lead them straight and true... Their road will be long and hard... Some will never return. Embrace these, Father, and receive them."
.. and Americans did pray on D-Day.
More articles about D-Day can be read here...