Co/ parenting

So I have a 5 year old and we both co- parent my son 50-50 and get along very well. Here lately his dad has been teaching him to pray to god and about Jesus. I’m completely against this. I’ve asked him to quit saying these things to him. Well tonight my son told me his dad said that I don’t believe in god because… and proceeded to tell him some really personal things from my childhood that happened to me. I’m livid, he has no right to tell our young son things like that. That’s not a burden he needs to carry! I’m so mad