Wow, that is harsh, and I'm sorry you have to deal with that. If I were you, I would do whatever it takes to simplify the situation. I'd rather pretend to be a Christian than take my baby's mother to court and potentially lose custody.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell