The Crusade of the Fallen Hero Part 1: Cursed Origins(On Hold)

In an alternate timeline, God and Satan made a wager. Satanic's forces must collected all of the Seven Void Keys or bring about world domination in the mortal realm within 100 years to bring about Armageddon. The Holy forces will fight in to prevent that from happening. Rather than Demons and Angels fighting in this war, their half children the Nephilim(Earth celestial beings) will carry the conflict until it's end. After the day when the wager was set, the followers of Satan attacked humanity. Humans with help of the Angelic Nephilim, drove away their enemy.Due to their newfound common enemy, most of humanity joined forces with the Earth Angels to prevent the greatest war from happening.
Now, 47 years after the pact, the world gave rise to to professions of Exorcists, Warriors, and Reapers. Through it all, a legend gave rise in the conflict. Xavier Kurogane, son of one of the greatest Reapers. He had lost something important to him and now he has return to America to reclaim it. Join Xavier and his friends of Squad GR has they face cult members, Demonic Nephilim, and themselves. Will he prevail against his evil foes? Or will he give in to the demon inside?
Disclaimer***, In this universe, I talk about religions disappear expect for the three monotheist religions(Judaism, Christianity, and Islam). If I insulted your religion in anyway, especially three listed here, I sincerely apologize and I will go back in my work to fix. But those who have other religions please understand it's just a story and not the real deal. Thank you for reading my first work and I due hope you will enjoy it.