Replace "In God We Trust" with the original motto of the United States, "E Pluribus Unum".

In 1782, the national motto of the United States, "E Pluribus Unum" (meaning "From many, One") was created. However, in 1956, this was changed to "In God We Trust". This was due to a fear of Communism, which promoted Atheism. In denouncing Atheism, Congress tried to denounce Communism by proxy. However, in the modern day United States of America, Atheism coexists as one of the many religious/spiritual groups within the United States. Similarly, many citizens do not believe in any god or deity. The first Amendment supports these American's right to choose this path, as it states that "Congress shall make no law respecting an establishment of religion".
The current Motto violates this by intertwining religion and government.
Our motto is, has been, and shall always be:
E Pluribus Unum