What does a it matter if he's an atheist, agnostic, theist or anything else for that matter Perry?
I think that blaming you for her loss of faith is unreasonable. If she didn't feel that there was any substance to the claims of ttatt then she would have continued being a JW regardless. It seems to me that it's an excuse to cut loose and do as she pleases.
I'm sorry for the situation you find yourself in and hope you can move forward positively from here!