How old will your LO be when you will put him through religion?

According to most assumptions made on this subject from many scientists and psychologists who study child growth mentality through years, most of them have come to the assumption that they should't be involved at all in the religion until they are totally mature and independent to their own opinions.
To some kids that maturity happens at the age 10 and to some, a little later.
What would be taught to kids before that would be an imposition and could attract a counter effect of defiance to what they have learned previously and come totally against it and start living in the opposite direction.
Another thing to think about prior to dressing up for Sunday church