It may be technically okay to celebrate birthdays but you know as well as I do that it is so heavily discouraged, it might as well be outright forbidden.
When was it technically okay for JWs to have sex when that is outright forbidden? He has crossed the line of being honorably confused.
And in the second place, the most liberal and tolerant JW in the world still believes in Armageddon and that all non-JWs will be killed in it, hopefully next week. I mean to be a JW, you really have to believe that, right?
Well considering that the watchtower keeps changing what it thinks armegoddon is that is problem. They have structure a false dicotomy, complex question, and "no true scottsman" falacy working hand and hand. It is so hard to explain in the nature you asked we need another thread. Maybe thats why the watchtower rewrote armageddon so that you can't ask a fair question about JW beliefs with out a long winded explaination. In general I can say no jws don't have to belief that for the sake of this thread. Unless the starter don't mind a little hijacking.