Well, to be fair, most contemporary Christians ignore the Old Testament, I was stating an argument against modern Christianity's God which is usually a loving God.
However, if we are wrong about the loving quality of God then could we possibly be wrong about other qualities? And who would wish to worship the God of the Old Testament? " The God of the Old Testament is arguably the most unpleasant character in all fiction: jealous and proud of it; a petty, unjust, unforgiving control-freak; a vindictive, bloodthirsty ethnic cleanser; a misogynistic, homophobic, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, capriciously malevolent bully." - Dawkins.
And if God isn't perfectly good it goes back to
A person is justified in believing that X does not exist if
(1) all the available evidence used to support the view that X exists is shown to be inadequate; and
(2) X is the sort of entity that, if X exists, then there is a presumption that would be evidence adequate to support the view that X exists; and
(3) this presumption has not been defeated although serious efforts have been made to do so; and
(4) the area where evidence would appear, if there were any, has been comprehensively examined; and
(5) there are no acceptable beneficial reasons to believe that X exists