"Congress shall make no law respecting an establishment of religion" sounds like you should keep religious symbols out of government such a for instance "God" in the Pledge of Allegiance
THE ORIGINAL PLEDGE OF ALLEGIANCE, WRITTEN BY FRANCIS BELLAMY, HAD NO MENTION OF GOD NOR THE UNITED STATES, INSTEAD REFERRING TO THE FLAG AS MY FLAG. THIS CREATES THE FEELING OF INDIVIDUAL PATRIOTISM, THAT IT IS NOT JUST THE FLAG OF OUR NATION BUT THE FLAG OF US. I PROPOSE THAT AMERICANS SHOULD BE TAUGHT THIS VERSION, A VERSION WITHOUT RELIGION, A VERSION ABOUT HOW THE FLAG STANDS FOR US, NOT FOR A GOVERNMENT, NOT FOR A POLITICAL PARTY. A VERSION THAT GOES LIKE THIS:
I PLEDGE ALLEGIANCE TO MY FLAG AND THE REPUBLIC FOR WHICH IT STANDS, ONE NATION, INDIVISIBLE, WITH LIBERTY AND JUSTICE FOR ALL.