Reincarnation of the Battle God is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

A time travel action fantasy of the strongest of mankind. “Even if the disgusting gods gave me this chance, an opportunity is still an opportunity. Since they want to end up dead, I will kill them.” The last survivor of mankind, Zephyr. The fight with the demons ended in defeat and the gods gave him a chance to go back 10 years in time. The demons who took everything away from humans and the gods who treated humans as beings for sightseeing. This time, I will tear them to pieces.