Although I enjoy Coulter's stuff, I haven't read this yet, so I shouldn't really comment. But I don't think "liberalism" can really be called a religion, because I don't think modern "liberalism" has any guiding principles. Causes and issues, yes, but coherent guiding principles? I don't think so.
Liberalism has subconscious guiding principles. That is what Ann is trying to point out. Unshakable faith on the part of those who don't believe in faith: the ultimate hypocrisy, in those too dumb to realize it. And Ann hits it spot-on.
Sure they have guiding principles. There is no God. Killing babies for your convenience is a sacred sacrament. Promiscuity and perversion are also sacred. A World Dictatorship is their goal; the sooner the US is destroyed, the better.