parent-child God-relationship

what we see when we look at Christianity is this language of parent-child relationship; yet that relationship isn't there. a merciful & just parent doesn't demand a bloody sacrifice to mete out forgiveness.
when we look at Islam, that parent-child language is not present, and yet the relationship between God & His servants exceeds that of a parent-child relationship; He meets the sins repented for by the Children of Adam with even more of His forgiveness and mercy.