The Pledge has nothing to do with religion, and everything to do with loyalty to your country.
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.
This is an oath of loyalty to country, not an establishment of religion. And my suspicion is that this Newdow person is simply a nut who wants to get some publicity at the expense of embarrassing his child. He's a big hero over at the DU, not because they think the Pledge is Christian brainwashing, but because they don't feel that anyone should pledge allegiance to the horrible, terrible, no good, very bad United States - ESPECIALLY while George Bush is in office.
So when I hear (see) people wailing about how horrible it is to force little children to pledge the flag, I think, "Traitor. :blammo:"