I don't like the word cult, having had some direct and indirect experiences I know how much things can become impacting, so I won't use the word in the context of the community you're talking about.
That said, most of the pseudoscientific groups that coalesce around a charismatic figure undergo, sooner or later, an evaporative cooling. This is a term first applied to communities by Yudkowsky, intended to mean that whenever reality disproves the leader, some member will leave, but the most fervent follower will remain with stronger beliefs. The more life disproves the common core identity of the group, the more those remain will be hardened into believing it despite all the contrary evidence.
It has happened for your group much sooner than I anticipated, but still I salute your spark of scepticism.
If it's worth saying, but not worth its own post, then it goes here.
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