Most American Jews I know are self described atheists...so voting Kerry or Nader is a natural choice.
Go figure.
I'm agnostic and am voting for Bush. Bush's religion doesn't bother me at all nor does it bother quite a few of my friends who don't go to church. Just because someone is a non believer doesn't mean they are likely to vote for Kerry. Having religion or not matters little to me. Having integrity and fine character matters a great deal.