Review Detail of USO in I Became a God of a Microscopic World

This is a typical "Create a Fantasy World Sandbox" novel. MC finds a world really small, where the people treat him as a god because of his massive size and he wants to gather faith. I really couldn't continue reading, this novel lacked a sense of reality to me. Who the MC is not explained, his motive to wanting power is simply not wanting to be beaten up by others in his homeworld. He somehow owns guns and grenades by the way. How? don't know. Author didn't explain anything he just has it. There are logical problems here and there that keeps me from taking the novel seriously. MC is basically the peak of chinese novel mcs, A psycopath of the highest caliber(he casually commited genocide and killed hundreds of millions of people just to get slightly bit stronger so he doesn't get beaten up on earth),basically no personality, and for some reason always thinks logically and is overly careful about things. We aren't explained how a ordinary person from modern times cares so little about killing others, he just doesn't and that's it.