Lets go back even FURTHER in Gods plan. This betrayer is foretold before his great great great grandparents were born. The betrayer had absolutely no start yet in any manner and god knew he would end up that way.
That means god knew Satan would fall and decieve man that he created in his image, and man would suffer along with his offspring for thousands of years, resulting in god sending his son to die a horrible death to fix up the plan that god made that went sour.
And people believe this stuff.
Gumby