My friends all seem to be pretty moral and they seem to be at least as good at practicing the Golden Rule as any other citizens. When we were students we organized contributions to charity and helped the needy. We made lifelong friends in the public schools.
Most of my high school friends are pretty secular in their outlook and a large percentage are nonbelievers. The percentages aren't much different among my friends who went to Roman Catholic schools.
Here's a bit of propaganda from one who supports government funding of Roman Catholic schools. They need all the support they can get because Roman Catholic values are coming under heavy criticism lately. Roman Catholic students have been bussed to anti-abortion protests and school clubs for gays and lesbians have been banned in the Roman Catholic schools system. "Sex education" is a joke.