I've got a question for everyone who insists that the words "In God We Trust" and "Under God" are not an establishment of religion when they are prominently displayed on our money and in our Pledge of Allegience (and on just about every government building). If, as has been claimed, these are inocuous, ceremonial words that simply celebrate the heritage and history of our nation, then what happens if at some time in the future (and it may be sooner than you think) Muslims become a large enough group to gain a majority?
Will you have a problem if they suggest, mildly and with respect, that the word "God" should be replaced with "Allah"? After all, it would only be a recognition of the Muslim traditional and linguistic history, and not at all about a "founding of religion". It's not like they're pushing their full religious beliefs on you -- they just want to recognize in their traditional language the exact sentiments already present.
Think about it --
"In Allah We Trust" on the money.
"Under Allah" in the Pledge.
Would you be offended or upset by that? Why? The term "allah" simply means "god" in Arabic, so there really shouldn't be any reason to be angry, worried or threatened by it -- it means exactly the same thing! If it's OK and not an imposition of any specific religious belief or faith, then using a word from another language that has exactly the same meaning shouldn't bother you at all.
On the other hand, perhaps if you consider the situation in these terms, you can begin to understand why the prevelance and ubiquity of religious-words (like "God") on our national symbols, seals, oaths and money do seem somewhat oppressive and offensive to those of us who don't have a belief in your gods.