He actually thought of the SDAs before he could think of JWs
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Technically, JWs are SDA....Russell just re-warmed then re-packaged and stapled a new label on his group and called it IBSA...but in reality, his concepts were SDA concepts.
Then Rutherfraud re-packaged and stapled a new label on IBSA and called his product "Jehovah's Witnesses".
It's a vicious cycle...
But, yeah, it's hilarious that for all of WT's brags about the effectiveness of the preaching work, very few people can tell you even one meaningful thing about JWs or their beliefs.