You're the one who says salvation comes according to our choices. It's a logical question to ask what determines those choices?
If you're not comfortable conjecturing about other men's "choices," then I'll ask you only about yourself. What allowed/caused you to "choose" Christ when others didn't/don't?
I was raised in church and attended regularly my whole life. I had heard the Gospel preached many times, and learned about the Bible in many Bible classes. I realized, when I was 13, that I needed to come in obedience to Christ. I went forward during a Gospel meeting on May 17, 1988 and obeyed the Lord by being buried with Him in baptism.