You say you are "atheist, but culturally christian" because you are agnostic but try to love your neighbor and fight for the poor.
I say such because I don't believe in god but I live in a catholic country that has eight public holidays of religious origin where people don't go to work (I'm just very lazy and every day in which I don't see my boss' face is a wonderful day).
Hidden beneath a superficial rationalism, they provide a seemingly intellectual defense of imperialism, push islamophobia, and use it to create a smokescreen for the injustices of global capitalism. 2,3