Better reasons to quit Christianity

[Skepsis]

Not sure I understand. Why is it necessary that God predetermines every choice you, or I will make (if such a God were to exist, I mean). Am I misunderstanding what you wrote? Please clarify.

No, you got it. Here's why I think that this would have to be the case in a world with a God whose attributes included omnipotence and the power to create:
If this creator has the power to make any world he wants, then it follows that he necessarily takes free will from the equation. Reason being, if it is the case that he can make any world, he chose a world where events played out a certain way. If he chose a world where events played out a certain way, then all the events of that world are subject to his will. If all events are subject to his will, then nothing that occurs in that world is against his will (unless he is too stupid to make a world where everything matched his will) and all choices you could possibly make are null. Choices are nullified because the your will is really the will of that God, having chose the universe where you would make the decisions you are making and not different decisions. To rephrase, you aren't the arbiter of your own choice, the omniscient God chose the world where you would choose as you do. True free will isn't subject to a God's choice of a world.

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If you want the reason most people on this site became atheists, try looking to prove God.
If you find something that you think proves a God exists, bring it to me to deconstruct and obliterate. The chances I haven't heard that argument are a million to one.