 They ask for 8% of your income to be donated to your parish and 2% to other charities. So that's the biblical notion of giving 10%, as Abraham gave to Melchizedek. And they've been so successful with that that they do not charge tuition in the Catholic schools and the diocese of Wichita. If you're a practicing Catholic, you have to sign a family school agreement that says that you're a practicing Catholic and that you're expected to tithe.