Should mandatory (or voluntary) prayer be permitted in public schools?

I believe that it should not be mandatory or that it should be voluntary. Not many people have the same religion and since the USA has freedom of religion and has many cultures not everyone going to one same school will believe in the same religion.  If a parent wants their child to pray or have any type of religious interactions it should be at any catholic or Christian schools. Not many people believe in the same religion so it would be a big controversial thing going on if they pray and the religion is Christian what would people who are Jewish feel. The right thing to do is to make after school clubs to be permitted for public schools, but it should not be mandatory.