Primary
https://www.theodysseyonline.com/how-growing-up-in-christian-school-changed-my-life This is a first hand account about how growing up in a religious affiliated school can change the way that people develop. Maybe not how they do school work, but definitely how they mentally develop and learn to handle things.
https://pacesuccess.net/danger-of-growing-up-christian/ This is a first hand account of how a man thinks growing up in a christian household is dangerous for the mind, body and soul.
https://medium.com/the-unlisted/growing-up-in-a-christian-school-1a34da5d0d9c this is another firsthand account of a negative opinion about growing up at a Christian school. Although, this is an account of a female versus a males account.
Secondary
https://psychcentral.com/news/2019/02/09/how-does-religion-impact-child-development#1 This source is a description of a study done that shows the correlation between the statistical families that do and do not grow up in church.
https://www.secularism.org.uk/33004.html How a religion can help preserve or create morals and this can lead to making good decisions which goes into development.
https://www.choc.org/primary-care/ages-stages/6-to-12-years/ What non religious children can do at every age level.
https://www.focusonthefamily.com/parenting/leading-your-child-to-christ/ What religious children learn at different ages.
Book
https://www.childtrends.org/wp-content/uploads/2002/01/Child_Trends-2002_01_01_FR_ReligionSpiritAdol.pdf This sources is a secondary source that describes how religion affects a person from childhood throughout adolescents.