That is only because you see islam as a religious movement and not the terrorist cult they are.
That many adherents engage in terroristic acts is part and parcel of Islam's justifications for violence against non-Muslims.
Yet, from a civilizational and societal standpoint, if I had to pick between Islam and Secularism as an opposing force, I would pick Islam every single time as the preferred opponent.
Radical secularism, if not rejected, saps society of not only the vitality to defend its own existence, but of the rationality needed to even make meaningful distinctions between religions at all.