Religions have always had trouble explaining the inequities of birth. Some of us are born sick, or deformed, or in pain, or drug-addicted or to a dirt-poor family. Some babies are never out of pain their entire short life.
Others are born healthy and rich and enjoy a long life of luxury. Without any proof, religions say that the next life will compensate for the innocent suffering in this life.
Non believers say health and wealth at birth is mostly random. Anyone who has visited a home or school for horribly disabled children will have a hard time believing that this was planned by a loving God. Random bad and good is easier to accept than planned inequities.