My View
I don't think she said anything really wrong. She was asked how what Jesus said as an historical figure compared to what Martin Luther King and Gandhi said, and she answered it. To an extent, you can't study literature or history without some mention of religion.
That being said, as a Christian I do strongly believe in separation of church and state. I realize it protects me as much as anyone else. If we open the gates to religion in public schools and government, who's to say who's religion will be endorsed?