Then you're still doing brainwashing/indoctrination. Let's not forget, it's "irrespective of the opinion's merit".
Besides, just as you hold your "must be provable" views dear, similarly the religious parent holds his or her religious views dear.
I think there's a useful distinction between teaching a set of opinions that must be held regardless of evidence and teaching the practice of forming one's own opinions based upon evidence, but it's a tricky point to make.