Look at how religious people sin, and sin, and sin, and sin. But they excuse it. "God will forgive me and I will go to Heaven."
This is immoral.
And it's even more immoral to force this superstition on impressionable young children, treating their minds like they're property of the religion.
If you don't believe in an afterlife, you're much more greatly motivated to live this life as best you can.
Being good simply because you fear punishment is not being good at all. It is being a slave.
I pity these religious people who excitedly say "Well you'll be sorry when you die and you have to face God!" They are no different from the pathetic house slaves who would gladly snitch on their brethren and mockingly say "Massa gonna whoop you good! You gonna be sorry, negro!"