would stay well clear of introducing children to any religion or no religion without getting the OK from their parents...even my grandchildren.
When I was a Catholic school teacher I indoctrinated many children but their parents had chosen to send them to a Catholic school. We didn't call it indoctrination. We said we were enabling the children to build a relationship with God and helping them to learn about Jesus, his life and teachings and the teachings/works of his disciples. We also said that we were teaching them the traditions and practises of the Roman Catholic church. Looking back I indoctrinated children because I taught Christianity as fact not as a belief system and, although it was never said directly, there was always the implication that we were right and all other faiths were mistaken. I once got into trouble from the priest for saying that God and Allah were one and the same. I said that I had several names Mum, Christian name, Mrs * but I was the same person. Then I really blew it when I added 'just like the Trinity'
Now I regret indoctrinating children. There is nothing wrong with teaching about faiths/non faith but we shouldn't teach any of it as fact. Religion and faith is subjective. We should give the children the information (warts and all) and leave the rest up to them.