Exploring History With System

[ This story takes place in different timeline and universe. ]
Ryuga was a person who born in 3091. Till that humanity have destroyed them by falling in the wars, open corruption and exploitation. People have long stopped believing in gods or good karma. Technology have returned to level of 1980.
As unjust of human race have reached beyond all the limits, all the apocalyptic ending explained in all religions that was thought nothing more than myths started to come true.
whole human race was wiped out in this apocalypse. Ryuga got born back in time in India. He started to study all the religions and any possible information regarding them.
He in efforts to change future of apocalyptic ending started doing all the efforts. He became successful person with a lot of money and reputation.
He established many organization to help people and improve the conditions of justice system in world. he died after getting old. In his this life, he had to face many problems by politics and some big industries but he negotiated and changed their nature of not completely to good side than at least to side that does not turn cruel or do exploitation.
Arc after dying remained as a spirit in world seeing it again turn in evil and facing apocalyptic events again.
He knew that he had failed in his motive of changing everything.
Then again got reborn in second life but with a system this time which gave him a chance to go back in the history of various religions to change things from the roots.

[ Note- Main Character will visit times like Mahabharata, heaven angel rebellion and other things. I mentioned word history in the tittle of novel name because I am no one to judge someone’s religion and make judgement that which one is history or which one is mythology. So, I respect all religions. ]