Of course, but you're not seeing it from their point of view. If they actually believe in all that, they will surely want their children to learn and follow those teachings. In some places, moral standards are taught with religion, not as a separate discipline.
Letting them wander off in another direction would go against their principles (for example, if they are christian, they made some sort of compromise with their church when they baptized their child).
When they are older, it is obvious those kids will choose whatever path they want. You might believe they are forced, but it's not like that. The number of young people seen in churches is vastly reduced as time passes by, which proves the brainwashing doesn't work that well.
Edit:
it was because us non-believers feel offended when you throw around claims that we'll all go to hell when we die
Can a person who doesn't believe in hell feel offended by that?
I would just laugh and point them to
this article