Trying to appease God to gain entrance in an afterlife is the cause of so many of the worlds problems. If we were to drop the notion of an afterlife, we could still keep the beneficial aspects of religion. Just jettison the bad stuff.
If people stopped believing in an afterlife, what sane person would decide that a reasonable way to eternally provide for their family is to die as a martyr killing infidels. Some extremists believe that if you die as a martyr, then you and all your family are guaranteed entrance to heaven.