That is an important distinction to make.
Islamofascists have declared war against not just us but all of Western culture. We haven't declared war on them.
We can continue our current approach of trying to divide Islamic radicals or take a scorched-earth Crusader-style model. I wouldn't have a problem in theory with declaring a Crusade, but America isn't yet convinced of the need to do so, and at least for now, we still have some relatively moderate Muslim states we can work with. We also have to deal with the fact that America is no longer a predominantly Christian country and liberals and atheists need to become convinced that Islam is an existential threat against women and liberal views of religious freedom.
These things take time.