Mysterious Redovian Book

This is a ancient book found in Zimogrod, the capital city of Holy Imperium of Soleaquil, it is dated roughly to the time Zimogrod was apart of Redovia 
 It was a cold winter night. The people of Helis were angry. Angry as they were cold yet thier god, Helis had yet to bless them with his light. They tore down their mighty temples yet 1 man. 1 who stood against all. His name was Redov. He worshipped Helis when it was storming, and ect. He was noticed by Helis and was told to make a ship. A ship that can stand against floods and blizzards. The following day, the ship was constructed. He sweated building the ship with heavy materials. He waited for a message alast, A flood. He retreated to his ship, hoping he would survive as the others begged on thier knees, Helis wouldn't care. One month later, the flood would subside. As Redov saw this he asked Helis "Why must you do this?"
 There was no responce. As Redov looked at the ruins, he believed he would make something almighty. One that would be the last stronghold of the world if it were to end. He strongly believed that Helis spared him as he hadnt sinned but those others did. Redov created the last stronghold for an entire year and called it Zimogrod. He soon had children who would take his blood and continue to develope his town.
 Though as Redov grew old, he wondered, why did Helis kill those people? Why?