Missouri voters approved an amendment to the state constitution Tuesday that proponents say will help ensure the right to pray in public.

The amendment was on a statewide ballot and had widespread support, though critics said the right to pray is already protected under the U.S. Constitution and Bill of Rights.

State GOP Rep. Mike McGhee and other supporters agreed, but they said Amendment 2 is really an effort to make the state constitution match the U.S. Constitution and protect Christianity, which they said is under attack.

McGhee, whose legislation led to the amendment proposal, told FoxNews.com about an incident in which a teacher told a kindergartner singing "Jesus Loves Me" while swinging on the playground to instead sing "mommy loves me."

McGhee thinks the teacher simply didn't know the law and said the proposed amendment attempts to make clear such rights.

But critics said the amendment will open the door to more lawsuits.