Slick has his detractors, but I think he's pretty good overall, and I think most of his doctrine is sound, too. No idea what denomination he belongs to. I like that he has a lot of different information on heretical cults at his main site. If you want to get a basic, beginning understanding of what Mormonism or JW is (etc.), it's all there in convenient and easy to read form.

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Vaughn Shideler
St. Andrew's Presbyterian Church
Toronto, ON, Canada