Unless you've forgotten, the pledge of allegiance is a pledge to your country, not to a religious entity. If it was religious in nature, it would be a prayer, not a pledge.
"I pledge allegiance, to the flag of the United States of America, and to the republic, for which it stands, one nation, under God, indivisible, with liberty and justice for all."
I believe in God, but not necessarily the same one or ones as the next guy. The term "God" is actually pretty generic. One thing that I find interesting, though, is the same people who have a problem with the fact that it's in the pledge... they usually don't have any problem whatsoever with calling the same God that doesn't exist to damn something, or just throwing out the term "God" in vain throughout the day. These guys probably make more references to God than I do, and I'm a Christian.
The references to some sort of deity in our American culture are prevalent. While "under God" was added to the pledge within the last several decades, the phrase "so help me God" was included from 1776 in the oath of office for military and civilian national officers. Do you think anybody ever really tried to push God onto anyone joining the military? The military's mission is to break stuff and kill people. Not spread the gospel of Christ. Adding "so help me God" to any oath doesn't change the mission or the design, and the only thing it does is make it stronger for some people. To others, it's a meaningless addition. Kind of like the word "indivisible." I don't think America is "indivisible." I think we clearly indicated that the country can be divided when we had the civil war. We're clearly a divided country when it comes to party lines. We divide ourselves on just about every issue imaginable, including, ironically, the pledge of allegiance. So after you say "under God," you're thinking to yourself, "man, the country is so divided on the issue of whether there should be an 'under God' clause," and then the next word that's coming is "indivisible." I love it. I have more of a problem with the "indivisible" part than I do with the "under God" part, but it's not like I'm going to make a federal case about it.
The whole "under God" issue seems to be child squabble. If you don't like it, don't say it. It's a free country, and saying the pledge of allegiance is supposed to remind you of that.