Although segregation may take place during weekday events, family-integrated churches are generally united in having children in the main worship service on the Lord's Day.
"[9] NCFIC is a parachurch organization, founded with the mission of promoting the sufficiency of scripture for church and family life and restoring family-integrated worship.
"[17] Andreas Köstenberger has stated that the movement elevates "the family to an unduly high status that is unwarranted in light of the biblical teaching on the subject".
[18] In his book God, Marriage, and Family: Rebuilding the Biblical Foundation, he concludes that churches should devise ways to disciple members, including young people, by instructing them in peer group settings, stating "using a peer group structure does not necessarily mean that the natural family structure is subverted but may helpfully complement and supplement it.
"[20] Presbyterian pastor Shawn Mathis argued that the movement's rejection of age-segregation was biblically unfounded and contrary to historical facts.
[21] A chapter by Timothy Paul Jones in the book Navigating Student Ministry argued that proponents of family-integrated ministry are historically in error when they claim that minister-led classes for children are a recent innovation that arose for pragmatic reasons; such classes existed for the purpose of catechetical instruction at least as early as the churches overseen by John Calvin in the city of Geneva.