This builds on a comment I made to yesterday's post, which was inspired by a remark of my wife's.
If God does not exist, then, in normal cases[note 1], the biological parents of a child are the persons directly and fully responsible for the child's existence. Thus, if God does not exist, then the parents, collectively, have the sort of role that, on traditional Christian views on which God directly creates the human being by creating the human being's soul, God has. But for the human parents to see themselves as having this God-like role distorts the parent-child relationship. There is thus moral reason for parents to believe in a deity who directly creates each human being.
If one thinks—as I think one should—that the fact that one has moral reason to believe p is itself evidence for p (it is much more likely that one have moral reason to believe a truth than to believe a falsehood), it follows that the above considerations not only give a moral reason for to believe in a deity, but they give an epistemic reason as well.