James87, A two year investment in a relations may seem like a long time to just toss out without some effort to save. Take your two year loss and move on, it is far less of a loss than 40 or more years of what you are facing if you marry this person.
You may love her, but you will grow to hate her religion, resent her for it that will only make your relationship more strained.
Good luck on whatever path you decide to take!