And if they chose politicians who say they want to make war on Israel or the US, that's ok? Sorry, but I don't see why it was worth 2000 US military lives to give Iraqis the right to establish an Islamic government. That may be nice for them in some sense, but it's not the kind of vital US interest that the military - and military - lives are supposed to be used for.
We aren't extablishing an Islamic government in Iraq. In Iran you have an Islamic government controlled by religious leaders, in Iraq you will have a government that the people get to decide. Just wait until the next election, I will bet you anything that the Sunnis vote and a Sunni, Kurdish, Allawi government forms that is pro-secular.
You seem to be forgetting that Afghanistan has Islam far more enshrined into its laws then Iraq does even if this draft goes through, which it very well may not. There are many drafts going around right now.