You a Christian?  Ever take your kids to church?  The synagogue?  The mosque? A buddhist temple?  Taoist temple?  Hindu temple?

Point is that I'm sure we all (myself included...even though I think of myself as a person who tried to be an impartial parent) inject bias into our kids.  We see ONE story of this kid's life.  One.  Could it be that the mother and father actually taught the kid as impartially as possible yet he still arrived at this conclusion on his own?  Possibly.

The kid just got a great lesson.  Will he learn from it?  Maybe.  But, without the lesson, it's unlikely he'd learn anything.