Exmormon.org has been around for a LONG time. There is actually some very good stuff on the site. This article is a tiny sampling of the body of evidence on the site.
The history of Mormonism is quite interesting. Most false religions have similar histories.
But the unhealthy obsession and liberal-like lack of any sense of history or perspective makes these attempted jeremiads a bit psychopathic.
There’s not a good spirit there.
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I remember in high school in the 70’s seeing Walter Martin lecture on Mormonism.
He did not need to resort to shrill hysteria.