Lucifer's origin

Lucifer was once a human like most of what the demons was. But lucifer was obviously diffrent, he was born by god and he was the best and strongest human in the 10th realm. He was alive for about 7 months when he saw the one who birthed him died

Story
The day of his birth he already had an impressive aura, every human gathered around and looked in awe, after about a month he already looked 10 years old, And was better then everyone at killing demons. When 7 months went on he already had the body of a 16 year old and stayed like that for 10 years, it was also when he saw his birth mother die, during her death he couldnt even cry, only smile and laugh about how weak she was. He killed most of his tribe after 4 years while laughing and grinning about how none of them could even get close to his strength. One day while walking around he heard from a man that there was a way to turn demon, after hearing about it lucifer begged him to tell him how, the man wouldnt tell and lucifer attacked, lucifer and the man fought until the man gave up and told him how: "to turn demon you need to activate the demon altar which will turn 90% of the human population to become demon" Lucifer grinned and said "YOU!! shall be the one to accompany me on the way there". he was forced to be with him, and they set out to find the demon altar. after looking for about 10 years they finally found it, the man who looked about lucifers age when they first met looked around 39 now lucifer only looked 17 years old, Lucifer quickly asked "How do we activate it"? The man said it needed the blood of the one who wants to activate it. Lucifer asks what it means, the man says that lucifer has to be killed to activate it. Lucifer gets enraged but before he gets to do anything the man says "You would be reborn as half human and half demon, but mostly demon" Lucifer then gives the man a sword to stab him with. Lucifer gets killed and the demon altar starts. It begins to chant words only gods could understand. The man with him was also turned into a demon with lucifer and lucifer comes back from death. When he is back he looks diffrent, his eyes are glowing red and blue he has horns all over the body and has long luscious hair, then says "Father, i am the STRONGEST"! He then kills the man with him and laughs and goes on a killing spree killing humans and demons alike until he got bored because of how strong he got, thats when he united all of the 10th realm under him and after that he goes on a murder spree in the 9th, 8th and 7th realm untill the 7th and the 9th gave in, and the 8th fought back and won.