When you get in your car and drive down the street, you are subscribing to a utopia.
Trafic laws are fair, practical, almost self-enforcing, and amazingly successful. Trafic laws work and everybody agrees with them. Even the most hardened criminal knows to stop at a red light.
Trafic laws are a type of morality. In fact, I call them a type of " objective " morality, in that everybody believes in them and everybody follows them. There are no atheist drivers.
The true validity of a philosophy or religion is in its practicality. Does it work? Is it applicable to your daily life?
Believing in God is not necessary to drive a car but a belief in traffic law is.