Refusing medical treatment for children on religious grounds is legal to varying degrees in 43 states. https://www.healthline.com/health-news/parents-beliefs-a

Refusing medical treatment for children on religious grounds is legal to varying degrees in 43 states. https://www.healthline.com/health-news/parents-beliefs-about-medicine-child-abuse#1 https://www.healthline.com/health-news/parents-beliefs-about... Anti-vaxing is not an organized religion but I could see organized religions adopting anti-vaxing beliefs.