God loved Satan when he was still an angel named Gabriel. Gabriel sinned by thinking he was better than God and God cannot be with sin so he cast Satan and all his followers into the abyss, better known as Hell. I'm sure that if Satan were to repent God would gladly take him back, though not without punishment. But the bible says that God will defeat Satan, so whatever that means it means that there will be no more sin so God can have us all. Even if we do sin God will have mercy and take us back because Jesus died for us so we can go to Heaven. we just need to ask for forgiveness and help