There is an argument that free will doesn’t exist because there is an unbroken chain of causality we are riding on that dates back to the beginning of time. Meaning that every time you fart, scratch your nose, blink, or make lifechanging decisions there is a pre existing reason. These reasons might be anything from the sensory enviornment you were in the past minute, the hormone levels in your bloodstream at the time, hormones you were exposed to as a baby, or how you were parented growing up. No thought you have is really original and is more like a domino affect of neurons firing off in reaction to what you have experienced. What are your thoughts on this?
It is not really weird, OP is arguing that the universe itself is deterministic. Taking a mechanistic approach to refuting that claim is perfectly valid.
There are a myriad of examples of physical processes that are chaotic, this invalidates OP’s claim.
To address the morality point, if God is the source of goodness and morality; beyond the question of “which God?” ; it means objective morality doesn’t exist, because God can change it’s mind about what is “good”.
But that is a discussion finds a different threat.