Yes, I became a Christian because I was born into that environment. I didn't select from 4,000 religions deliberately. Likewise, I didn't choose the culture and native language I was born into. I neither grew up dancing Brazilian samba nor eating rice for breakfast, but waiting in front of a pedestrian's red traffic light to turn green although there is no car coming ...
Religion is closely interwoven with culture.

(Brainwashing doesn't have a negative connotation? Come on...)