Which Christian branches/sects have information about their belief system hidden from new members but revealed to established ones?

Some religions have what might be described as unpalatable, or at least 'weird' beliefs, from an outside perspective, and sometimes they hide these beliefs from new members and reveal them only to members once they've become well-established in the religion. The most obvious example outside of Christianity is Scientology, which seems to present one face to the outside world and to new members, but a slightly (or significatnly) different world view once you are accepted into it. This post is notmeant to be judgemental of that practice, for what it's worth, I would just like to know where this pattern exists within Christianity. Are there any Christian branches which display this type of pattern of behaviour? I know most do not. As far as I know, there's not any aspect of Catholicism or most branches of Protestant that is deliberately hidden from the outside and only taught to long-standing members. Usually, most churches wear all of their beliefs and practices on their sleeve.