She can say whatever the H-E-double toothpicks she wants as long as it isn't immoral nor obscene! She's the valedictorian. She earned her place at the rostrum. Because she was going to share her faith, she was silenced. That is wrong in these United States!
How long until students are handed their speeches by school administrators and told what they will say?
So if she had started talking about how her faith in Mohammed and Islamic discipline had helped her and they cut her mike off, would you still be so outraged?
Note that I said "inappropriate", not "illegal". Deliberately offending people who have assembled to witness a special occasion such a child's or grandchild's high school graduation shouldn't be subjected to obnoxious rants of any type -- whether it's somebody hollering at them that they'll burn in hell if they don't "accept Jesus" or that American servicepeople in Iraq are "murdering children", or whatever. And I think schools should be allowed to impose some appropriateness standards on student speeches -- if not, then why not allow speeches that are obscene or "immoral" though still falling within protected speech parameters? On what legal basis does a school prohibit a raunchy "How I lost my virginity" speech, but allow a proselytizing religious speech?