Dave, what you think is inappropriate is still Constitutionally permitted, if not required. Yours is a narrow, sectarian view anyway and not worthy of elevation to the level of public policy.
“All authority hath been given unto me in heaven and on earth. Go ye therefore, and make disciples of all the nations, baptizing them into the name of the Father and of the Son and of the Holy Spirit: teaching them to observe all things whatsoever I commanded you: and lo, I am with you always, even unto the end of the world” (Mt. 28:18-20 ASV).
It is now "required" for students giving graduation speeches to invite the audience to come forward and express their love to Jesus and "get saved"?
Would you like to re-word that?
Suppose a Jewish student invited those who wished to come forward and have a bris done in the middle of the graduation? Should we all just allow this to happen?
Maybe the local Baptist valedictorian can set up a baptismal pool and invite anyone who wants to to come up and get dunked. Or the Catholic student can have a priest confirm with holy oil anyone who wants to come forward.
SD
The girl was not authorized by the school to do what she did, and the school could not legally have authorized her to do it. It would be different if the school had announced in advance that students of any religion (including atheism) were invited to participate in a function where they could proselytize the audience. Then the school would have been treating all religious beliefs equally, and there should be no problem with an event like that. But that's not what happened here. How would you like it if you went to your child's public high school graduation, and the program included one prayer only, which was a highly sectarian Muslim prayer, capped by the student inviting the audience to join her in reciting the words that constitute a conversion to Islam (which per many brands of Islam, is irrevocable under penalty of death)?
I was going to respond but you said it better than I was going to.