Objective morality: how would it affect your judgement/actions?

[Foxaèr]

Western atheists that promote the "Good without God" simply take for granted that the behavioral norms and principles they consider self-evidently good and true are in fact predicated on Judeo-Christian principles.

Incorrect, for anthropologically speaking, morality (the concept of being good for the benefit of all) existed in society well before Judeo-christianity attempted to monopolize it.