I'll start with... "I need not the promise of Heaven to see merit in good deeds".
And... "Adults with imaginary friends are dumb!".
"With or without religion, you would have good people doing good things and evil people doing evil things. But for good people to do evil things, that takes religion." Steven Weinberg
If you want to sin and be a inmoral and be a career criminal just become a Christian and you can sin all you want and you will be forgiven and reap the rewards of heaven, however if you're a good decent honest hard-working human being who dedicated your life to helping others but yet you don't believe in a deity you're going to suffer for all eternity in the depths of hell, makes me wonder.