Well, Rick must have failed to spend more time in prayer to decide on that aspect. He doesn't even have to pray though. But as far as inviting a non-believer into a church of whatever background, i don't have a problem with it... unless of course it compromises security of the congregation.
If Hillary came to my church she would have to sit in the pews with all of us unwashed and she would be subjected to a fiery gospel message sure to curl the bristles on her broomstick.
It should have been the right thing to do. It will scare the devil out of her...
Rick Warren may spend hours on end talking to God, but it is pretty clear that he doesn't listen.