Taken from Newdow vs. Congress (9th Circuit No. 00-16423)

"Although the defendants argue that the religious content of 'one nation under God' is minimal, to an atheist or a believer in certain non-Judeo-Christian religions or philosophies, it may reasonably appear to be an attempt to enforce a 'religious orthodoxy' of monotheism, and is therefore impermissible. The coercive effect of this policy is particularly pronounced in the school setting given the age and impressionability of schoolchildren, and their understanding that they are required to adhere to the norms set by their school, their teacher and their fellow students."
From the majority opinion of Judge Goodwin.