To be honest, I didn't mean my post as a rebuttal, or something because you responded to Fezzy. I mean that like all socialization, indoctrination is a key part. It was negative in Fezzy's reply, but I don't mean like that.
Religion is TAUGHT through the Bible and other spiritual guides. No one holds a gun to someones head and forces them to stay a Christian once they grow into adulthood.
My point is, what occurs isn't just teaching, it's indoctrination into to a particular ideology. Not only do you learn about Christianity, and it's tenets, but it's philosophical, and ethical outlook becomes a shared view. The same way a child is raised in a culture, and attends school. Indoctrination occurs everywhere.