Rabbi Mendel Bluming serves the community as the Rabbis of the Chabad Shul of Potomac and is often challenged with this question.
Here’s a thought created on Jewish philosophy:
Good is only good for G-d chose it to be. G-d is not chained by anything, and could have chosen otherwise. He could have written “Thou shalt steal,” and “Do not help the poor and needy.” Helping our elders across the street would be the wrong thing to do, but mugging them would be desired.
Now you may say, anyone with a healthy conscience knows that to steal is morally repugnant and helping the needy is a righteous and upright deed. But our conscience is created by G-d also. If morality would be inverted, we would be wired in that direction. Luckily for all those old ladies trying to cross the street in the world, G-d chose the other way around.
Does this mean good isn’t truly good? Is morality nothing more than a whimsical imagination? Not at all. Only humans are impulsive and arbitrary. G-d is absolute. Good is absolutely as reality not because it feels good to me but because the Absolute One made it so. Morality is defined by the infinite model of G-d, not the finite nature of human feelings.
The real quandary is this: without G-d, how can anything be good or evil? Who becomes the decision maker? That’s a really good question
Rabbi Mendel Bluming and Rabbi Moss