"Membership is open to everyone, and anyone can leave. "
That's bullshit and they know it. "Everyone" can't just be baptised; a rigorous process must be followed. "Anyone" can leave, if they're prepared to be ostracised by family and their former social circle. Which is precisely the problem the various governments are starting to have with the WT. Can these blokes even lie straight in bed?
"Ryssdal claims that if children are baptized too early, it is the parents’ fault - not Jehovah’s Witnesses."
Nothing to stop the WT from requiring the very important decision to be baptised as a JW to only be allowed once someone reaches their majority.
Comparing JW baptism to confirmation is ludicrous. The Norwegian state church doesn't disfellowship and ostracise people who leave or try to fade.