Islam is actually a perfect reason why a knowledge of religion is vital to know what is going on in the world. I do not demand that all people believe in God...as I have said many times 'their path is theirs to walk'. But religion, like it or not, impacts the values and mores of any society, politics, legal issues, government policy, economics...those who do not understand religion are at a disadvantage when it comes to understanding the issues of the world. Islam is a great example, because they are currently the religion that is causing havoc.
In fact what amazes me is that every time an atheist or liberal screeches about the terrible things done in the name of God, they always point it at the Christians who haven't engaged in such things for about 500 years. Yet they defend Islam with a titanium shield.