It depends on her state of mind. Maybe the comfort religion gives her is too strong to argue with.
Before leading her to question her religion, I would consider how long ago the divorce was and how established her sense of self is now. Is she strong enough right now to process the type of cognitive dissonance your prodding is going to instigate, much less go through another major life transformation (deconversion)? She may need her religion as a coping mechanism while of rebuilding her life and self-confidence. Let her have it for now.
Once you know she's in a healthy place, I think it would be appropriate to broach the subject.
Awww , you can try , but I don't think you'll succeed. If she is using the 'The is the Old Testament' reflex when something contradicts her beliefs , just point her to some of the things that are in the Pauline epistles ... about women not speaking in church and should keep quiet ... how the husbands are given divine authority to rule over their wives and how their wives should be obedient and loving to the husband ...
Then what is she going to say? Oh , but Jesus didn't say that! LOL.
Sometimes people just need an imaginary friend! Same thing we did as kids, God is just adults imaginary friend.