Maybe Christianity is not a cult, but the cult. When I hear people call a group a cult, what they typically mean is that the group is a pale imitation of Christianity.

Many Christians would likely take issue with this description because they don't want to be on the wrong side of the dirty word cult.

But I personally don't think it's much of a problem if the person you worship is Jesus of Nazareth.

One thing TFA did do was to describe very well the bad things about a cult: separating you from friends and family, controlling you with guilt, forbidding you from engaging honestly with differing belief systems.

I have not been pressured to cut off from friends or family, regardless of their belief systems; I am not controlled by guilt; and I genuinely try to engage the best I can with other belief systems. I'm pretty sure I could make a case for atheism at least as strongly as you could.