You can rest assured that no one will enter into God's Kingdom who doesn't belong there. What you have to ask yourself is do you belong there any more than a mass murderer or a common liar?So if someones a mass murderer, then accepts jesus into their heart, they are assured of going to heaven, if people like that get into heaven, i'd rather not go there thanks.
Nature doesn't have a will. It can't produce something that isn't already part of it.Humankind was created by nature from evolution and natural selection, nature doesnt create things for reward and punishment.