Gods: Start with fish, cat, orc

The protagonist is an upright, kind, friendly, independent, and brave young man who excels in academics.
He aspires to become a war god in a new era that maintains world peace and brings prosperity to the world.
As a result, his dependents were all cruel, bloody, easy to kill, and ignored all the truth, goodness and beauty in the world.
The protagonist decides that he must save them and make them feel the warmth and beauty of the world.
But one of his followers becomes more insidious, cunning, shameless and despicable.
When one day he becomes the most evil and terrifying god in the entire main world.
He left only one sentence to the world.
"I'm a good person! Why don't you believe it!"