What’s the big deal? Those monotheists are all alike anyway.
The girl's choosing to follow her father's new found faith rather than her mother's tradition. The mother has no business going to the court to stop her daughter... incredible, the fascistic thought process she must have there!
It's not surprising an adherent to a faith which compels physically altering half of children born to its followers doesn't grasp the idea of individual liberty and personal religious freedom.