Obviously, the person who called CF a cult has NO idea what an actual cult is. One of the biggest indicators of a cult is that is has a very charismatic leader, usually one who was "chosen by" the prior leader or was divinely chosen. CF has NO leadership that I've seen, it's all individuals coming to the same conclusion (not having kids is a good idea) through their own thought processes and personal experiences. Cults stomp down thinking and questioning.
By definition, the CF are not a cult, because we have no leaders, and we encourage questioning.
We ARE different, of course. But then sometimes to be your own person, to be true to thyself, you need to not be the herd.