FIRST of all my friend, I must say that coming onto this platform OR creating an alternate account for the purpose of trolling Christian and bible believing posts shows your insecurity with your own worldview. But I understand why you are insecure with it and lash out at people who hold to a biblical worldview.
I was an ardent anti-theist until I was 21. Back in elementary school I was telling the "Christian kids" there was something wrong with them for "believing in and talking to 'imaginary friends and calling them god.'" I didn't have internet during my teenage years into my twenties, so everything you have ever typed online about "theists" I have said it to their face. I loved to get into arguments with Christians about the futility of their beliefs, the lack of evidence for their beliefs, and the self righteousness and bias that their beliefs created (even though I didn't even know what they believed.)
But I was never satisfied nor fulfilled nor was I ever secure in what I believed. I looked forward to arguing with Christians about what they believed, not to prove a point, but to reinforce my beliefs to myself. Since I didn't have the internet to go to in order to look for such arguments, I just talked to myself about, "how that supernatural garbage couldn't be true, how it takes objective empirical evidence to verify a truth claim, how the existence of so many religions proves none of them can be true, how since the bible was written by men it couldn't be true, etc." I would talk about that stuff over and over in my mind unless there was someone to argue with; so I understand your insecurity and your need to lash out and reinforce your own beliefs to yourself.
SECONDLY, if you think the "central doctrine of Christianity is an OBLIGATION to CHOOSE what they believe" you have been misled. We don't choose to believe God. All people start out rejecting the God we know exists and GOD CHOOSES to reveal Himself to us and which of us will believe in Him. God may have chosen you while you're still in your rebellion against Him. One day He may reveal Himself to you and you too will hear His voice and follow Him, whether or not you think it is possible. He did it to me over 15 years ago.