Short answer: its absolutely wrong for you to divorce your wife, unless she has just now committed adultery against you.
You mention "fornication", which is a translation of the greek word inappropriate contenteia, which means sexual sin in general. You haven't told us what she's done wrong. Also, you haven't told us what you have done wrong? Are you living in purity? Could you throw the first stone?
I'm going to assume she has had sex before meeting your or that you have had sex with her before getting married. Neither of these is grounds for divorce. In fact, the latter is grounds for marriage (Exodus 22:16)!
Reading between the lines here, I'm going to assume she has a somewhat shady past and you married her because you wanted sex, but now you want something "heavenly" and are dissatisfied with where you are in life. The solution: start walking with the Lord in purity and love your wife! Thank the Lord for your wife every day.
I find it incredulous that she wouldn't even know much about your faith. You have to tell her you want to follow Jesus. Suggest she join you for a moment of prayer (don't push her but offer the invitation).
I have a wife that is not all that spiritual, but I've experienced the presence of God and His blessing as I've sat down with my wife for a 5 minute evening prayer on our sofa a few times a week. She usually doesn't say much, but I pray what comes to mind and she listens to me talking to God. We've been together for many years. I find the key to this situation to be living in holiness before the Lord on my part, loving my wife and generally being the kind of person God would be if He were downloaded into my body in my situation.
"seek ye first the kingdom of God,
and his
righteousness; and all these
things shall be added unto you"
(Matt 6:33)
Try to live in a way that if God ever asks your wife, she will tell Him you are an example of doing the right thing. Other "heavenly" things are probably just a diversion. Far too many people already being spiritual busybodies all over the place. Fewer people actually walking the walk.