Only God-centered education gives true wisdom.
“The fear of the Lord is the beginning of wisdom” (Ps. 111:10).
“The fear of the Lord is the beginning of wisdom, and the knowledge of the Holy One is insight” (Prov. 9:10).
“...in [Christ] are hidden all the treasures of wisdom and knowledge” (Col. 2:3).
This is the reason our secular education systems have strayed from the truth. Isn’t it foolish to think we can get a true perspective on God’s creation from a system that begins by excluding His words? I rejoice that my children this past year gained wisdom in some areas of life that I did not gain until theological seminary—because I grew up in a secular education system (howbeit one much less secular than schools today).
Here is the issue: Do we really think the Bible works in the real world? That it gives crucial guidance in modern life? If not—if we quietly assume the Bible is mainly intended for use inside Sunday School classes—then secular education will be our natural choice. But if we do think the Bible guides us in all areas of life, then we’ll give our children education that applies Scripture to every area of training for life.
Excerpt from "Biblical Reasons for Sending Children to Christian School"