If American schools taught creationism alongside evolution, this lends itself to further Christian influence in the public sphere.
Creating our education system to cater to Christianity lends itself to more laws and regulations established in favor of Christianity, which disenfranchises non-Christians in America.
Our separation of church and state allows individuals to choose what religion they want to affiliate with, or whether they want to affiliate with a faith at all.
When we start to allow church and state to be one of the same, how is it any different than the very terrorists that we are trying to defeat, who subscribe to the fundamentalist aspects of Islam?