I perfer "If God did not exit mankind would be need to invent Him". ... Voltaire
I hope you are aware that Voltaire was pretty much an unbeliever and that this rewarding and punishing god only "existed" for him as the Tooth Fairy, Superman or Bugs Bunny "exist" for you or me.
In other words, for him this god was just a virtual authority, a device to keep the ignorant and unsophisticated crowd from running amok.
Sometimes I really have to wonder why some theists use this not very flattering quote from Voltaire.