James87,
I with strong conviction feel that married to her i could get her out or at least have her less passionate about JW.
I'm sorry to say it but your conviction is misplaced. If she is like this now how will she be when you both get married
The whole blood transfusion thing would not be an issue, if lets say we have a kid and he or she needs a transfusion he or she will get one.
You underestimate the fanaticism of JWs. Once she knows that you're against a transfusion she, with the assistance of the elders, will find ways of circumventing you. Even if the child gets a transfusion, the fact that you stood up to your wife on that issue can break your family apart. By the way, she can be disfellowshipped for allowing her child to have a transfusion.
Look forward to eventual divorce; nasty child custody disputes; and your side of the family (non-JW) unable to see your children or grandchildren.