Villain with netori system

English is not my first language so please take care of me and if you find mistakes in it tell me I fix it as soon as possible.

Max Winchester died due to an "accident" while reading the novel after his death he meet God who allowed him to travel through and do whatever he think best but on condition to make Protagonist's life miserable. He also gives him the strongest system [Netori system] that help him steal Protagonists Woman, Chances, Luck, etc
Why does God want to make that Protagonist's life miserable? And why [Netori system] given to the max let's find out.

(English will get better after chapter 38.)

I don't own a book cover, I find it online, If creator wants me to change it just message me, I will remove it.