This man’s story is at catholicexchange.com/the-rosary-the-devils-defeat
It sounds like his conversion to the Satanic cult was motivated by hatred and not Truth.
I often wonder how often that’s true of other individuals.
I found this interesting from the article:
Around this time, he visited a séance and in his zeal held his rosary aloft, declaring, “I renounce spiritualism because it is nothing but a maze of error and falsehood.”