This used to be posted on the CREC denomination website. I think it is beautiful because it uses the Bible to make the argument.
All things are to be considered and conducted under the Lordship of Jesus Christ, including education, and especially the education of our covenant children. God has neither charged nor authorized the state to educate children within its civil jurisdiction. God has commanded parents to bring up their children in the education and admonition of the Lord (Eph. 6:4, Deut. 6:7). Given the importance and enormity of the task (Ps. 127:3-5, Deut. 6:7-9), and the impossibility of neutrality in education (Prov. 1:7, Matt. 12:30, Luke 6:40, Col. 2:1-10, 2 Cor. 10:3-5), we do heartily affirm the necessity of educating our children in a manner that is explicitly Christian in content and rigor.
Government schools are, by decree and design, explicitly godless, and therefore cannot be considered a legitimate means of inculcating true faith, holy living and a decidedly Christian worldview in the children of Christian parents.
Parents who do not fully understand the indispensability of Christian education should be warmly received into membership. However, the leaders of Christ’s church must thoroughly understand and plainly teach the divine imperative to disciple our children, the divine prohibition of rendering unto Caesar those who bear God’s image (Matt.22:20-21), the divine warning to those who cause their little ones to stumble (Matt.18:6) and the divine promises to those who raise their children in faith (Deut. 7:9, Ps.102:5-7, Ps. 103:17-18, Prov. 22:6, Luke 1:48-50, Acts 2:39).