We may have asked for God's help in protecting our soldiers, but in no way does that compare to saying that God has ordered us to kill them, to fight a jihad, like they are saying.
To the Iraqis, the difference may not be as obvious.
What's important is not really the intent of this national day of prayer, but the effect on the Iraqi population.
Any opportunity given to Saddam to convince more people of turning into martyrs means more bodybags will come back to the US and more civilians will die in Iraq.
We can't really convince the Iraqi people of anything, especially not with Saddam's rhetoric being the only thing shown on tv over there, resentment may grow in the beginning, but I think its a risk worth taking to get rid of saddam.
This is a very, very dangerous way of thinking: we cannot fully convince them, so let's just not care about the impact of what we say...
Everytime you make it look like there is a deep cultural conflict, you lessen the chance of achieving peace in Iraq, and in the middle east. Don't forget that the Iraqis are not the only ones involved: people in Saudi Arabia, Iran, Jordany, Turkey, Syria, Oman, Barein, aso... are carefully listening to what is said on both sides. If the US government is not careful enough in his speeches, in the message it delivers, it will feed the hatred towards the US, and it will have failed in its war against terrorism, because it will have paved the way for future generations of terrorists.
At some point, it may be necessary to take arms against clear threats. But even while doing so, it should never be forgotten that the ultimate battle against terrorism cannot be fought only with guns: it must also be fought with demontrations of one's good will.
You can find a reference to what I was alluding to here:
National day of prayer