One atheist trope is that Christian faith is childish. We have a duty to wean ourselves from immature belief a celestial father-figure.
To that many things could be said, but for now I'd point out that the very atheists who say this often adopt a paternalistic tone of disapproval. They themselves assume the role of father-figures. If you refuse to heed their fatherly advice, Hitchens, Harris, Dennett, Dawkins, Coyne, Stenger et al. will be disappointed in you. Don't you wish to make them proud of you?
Essentially, then, they become substitute father gods. They play on the very psychology they impute to Christian believers.