She's scared. I used to give my husband the silent treatment if he missed a meeting. Now we are both out.
Take her out on a date, maybe out to eat and a movie. Tell her that any talk of religion, God, anything spiritual is off limits. If there is something you both enjoy doing, try doing it together. What brought you two together to start with? Focus on those things. If you have kids pull out photo albums of when they were young of photos of when you were first married. She also may be going through menopause if you've been married for 27 years, the sex drive does lessen.
Hope this helps.