The Judeo-Christian mindset is, "What do I owe my fellow man." The leftist mindset is, "What does my fellow man owe me."
Another way to say this is that the religious are concerned with obligations and the leftist is concerned with rights. One is outward facing while the other is inward facing. One is selfless while the other is selfish.
Neither group is absolutely one or the other, but these are more an undercurrent and guide the externalities of each group. Each group's view of governance is informed by these tendencies.