Christianity advocates some good behaviours, but it doesn't teach good morals because the entire religion is based on faith which is itself an immoral concept. I don't think him attending church for 10 years will do any good at all.
I guess they'll teach good morals even if he doesn't want to delve into faith.
As far as I was aware, most teach children to be well mannered, polite, and to give what they'd expect to be given themselves in order to please God.The fact that people will do those things to please God rather than because they believe those things are inherently good to do undermines the credibility of any claim to morality that christianity has. Like I said, it teaches some good behaviours, but performing good behaviours for the wrong reasons isn't a sign of morality. It's just a coincidence.