"Just a plan?" God's plan for His creation, decreed from before the foundation of the world, is "just a plan?"
"Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure." -- Isaiah 46:10
God's plan is what is, one way or another.
Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour?" -- Romans 9:20-21"Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?
No choice, no love.
1) Where does it say that in Scripture? Hallmark, yes. The Bible, no.
2) Fallen man will always "choose" unrighteousness unless and until God gives him a new heart, new eyes, new ears and a renewed mind in order for him to know and believe in Jesus Christ as Lord and Savior.
Read "Bondage of the Will" by Luther. Here's a short, abridged version online...
It will help you understand whose will is sovereign and whose will has been mercifully over-ridden by the gift of unmerited, unearned, free grace.
"For it is God which worketh in you both to will and to do of his good pleasure." -- Philippians 2:13
Traditions of men.