Sure. Christianity fits the definition of a religion;
"Religion [is] a cultural system of designated behaviors and practices, worldviews, texts, sanctified places, prophecies, ethics, or organizations, that relates humanity to supernatural, transcendental, or spiritual elements."
source: Wikipedia
So, Christianity is not a fake religion, but a true religion. Not a true overnight bag, a true pasta dinner, or a true pipe fitting in aisle 11 at Home Depot, but a true religion. And as such, exists as at least one example that proves your contention,
all religions are fake, to be wrong.
.