Lets take that one step further. Jehovah's Witnesses are an apostate recruiting machine. They insist that before baptism one writes a letter officially resigning from their former faith, in effect, making them on the record apostates.
I wonder if they do that to break the bonds and make it difficult psychologically for ex-JWs to return to their original faith. Or is it just a way to try to insult "Christendom" to their face. I see no real reason for it. People change religions all the time simply by deciding to attend and join a new church.