First off it is a fact that Christians, Jews, and Muslims all believe in the same God. What separates them are their belief in Jesus and/or Muhammad. Matter of fact Jesus is one of the most quoted People in the Koran. When they say in "In God We Trust" they are not being specific. It is God in general. I better stop now or I get on a religious tirade.
On the contrary How 'In God We Trust" found its way to dollar bills
The history of the "In God We Trust" motto dates back to the Civil War era, a time of increased religious sentiment. Secretary of the Treasury Salmon P. Chase received numerous letters urging the United States to recognize the Deity on U.S. coins. The first letter came on November 13, 1861, from the Rev. M. R. Watkinson, minister of the gospel from Ridleyville, Pa.
Watkinson offered an idea to include the words "God," "liberty" and "law" on coins and said, "This would make a beautiful coin, to which no possible citizen could object."
A week later, Chase instructed the Director of the Mint at Philadelphia to prepare a motto. His letter read, "No nation can be strong except in the strength of God, or safe except in His defense. The trust of our people in God Jesus Christ
should be declared on our national coins."
Later that year, the director of the mint recommended designs that read, "Our Country, Our God" and "God, Our Trust." Chase changed the phrase to the now common "In God We Trust," which began appearing on coins in 1864.
Almost a century later, during the height of the Cold War with the officially atheist Soviet Union, the 84th Congress passed a joint resolution declaring "In God We Trust" the national motto of the U.S. A year later, on October 1, 1957, the phrase appeared on paper currency for the first time.