Christianity almost impossible without indoctrination

[Sword of Christ]

And perhaps this is a belief you were indoctrinated into! hock:

How deep does this rabbit hole go???

Everyone has had some influence from someone at some point in their life that was instructive in forming their view on whatever subject. It doesn't mean everything you believe has to be programmed into you like a machine but only atheists believe this if they deny any basis for freewill. You can see the madness involved there if you claim indoctrination for others when that's the only basis for what anyone ever believes including yourself seeing as you're biological programmable machine like everyone else.