Aronow v. United States

...It is not easy to discern any religious significance attendant the payment of a bill with coin or currency on which has been imprinted 'In God We Trust' or the study of a government publication or document bearing that slogan.

The Court maintained that the national motto has no purpose in a coercive power to aid religion - neither on the face of the legislation nor in its operative effect (its practical impact on society).

Short of those expressly proscribed governmental acts there is room for play in the joints productive of a benevolent neutrality which will permit religious exercise to exist without sponsorship and without interference.

...Adherence to the policy of neutrality that derives from an accommodation of the Establishment and Free Exercise Clauses has prevented the kind of involvement that would tip the balance toward government control of churches or governmental restraint on religious practice.

[5] A similar decision was reached by the Fifth Circuit in Madalyn Murray O'Hair vs W. Michael Blumenthal in 1979, which affirmed that the "primary purpose of the slogan was secular.