Do you believe your wife will go to hell?

No. I don’t believe in all that “you have to confess Jesus as your personal lord and saviour to avoid hell” crap. It’s in fact something not very widespread outside evangelicalism. I believe the Cross is working mysteriously, far outside the frontier of the visible Church. A God who condemns people that doesn’t recognize him is not a loving God, it’s a pervert. I believe that “to confess Jesus as my personal lord and saviour” is a way to live a better life here and now, and I don’t expect an eternal reward for that.

Is she agnostic or does she believe there is no god?

I’d say she’s agnostic atheist. She doesn’t know if God exist, but believes he does not, and in fact doesn’t care.