If Dawkins wrote it he presumably believes it. Why shouldn't he?

If you think faith is a good thing, then clearly you will want to pass that on to others especially your children, and will view his statement as outrageous. However if you believe that faith is a bad thing, then you'll see indoctrinating young and impressionable children as bad thing. It's not really surprising that opposing views come to opposite conclusions

Religious people are often ready to take a very similar tone against things they disapprove of.

I can understand that Jack disagrees with both the statement and the underlying assertion, but that's his point of view and I can't see why he's surprised that someone with a different point of view should think differently.