This view is not popular with the majority of Christians. Blasting public education in America is akin to blaspheming all that is holy and good. If Christians pulled their children out of public schools, voted down every tax increase having anything to do with education, voted to repeal the education portion of the property tax, and voted for candidates who would cut every dollar from education funding, then most families could afford the costs involved. Yes, it may even take some sacrificing on the part of parents. Of course, home schooling is always an option.
Children can help out by working.
When your children get older, have them work to share the financial load. It's not the church's job to educate. I heard this one just recently. Christian school critics balk at turning over the church's facilities for educational purposes because the tithe is designed to support the church's work, not the education of children. That's why we pay taxes.