Parents are better described as guardians. Children are people in their own right and to force a view (any view) on them is to violate them as individuals.
By all means expose a child to that which you think best and protect them from that which you think harmful - what else can you do?
As far as Christianity goes, yes give a child a firm grounding. Try to ensure they understand what it is and what it isn't. But to brainwash them is to do them a disservice. You cannot convert them for God has no grandchildren. But solid groundings give them something they may return to when it is their time to address and evaluate the issue.
They might need to see the other side before they can truly begin to appreciate Christianity. God willing they might not.