Good questions, but the whole concept is kind of creepy. Here is a dilemma that I struggled with:
When a Baptist (or any other religion) is resurrected, will this person then conclude that their religious faith is what saved them? How will they then react when a post Armageddon JW knocks on their door and tells them that the only reason they are in paradise is that they were lucky enough to die before the Great Tribulation - and if they don't change their ways they will be destroyed.