Wow. Good question.
I cannot answer for anyone else at all, except myself.
I am a Christian today even though I do not remember ever not having been taught that Jesus Christ was our Lord and Savior by my parents as well as many others. I still wandered into some things that nobody should wander into because even thought I was taught these thing, I really had no real reason later in life to believe them. And began a walk of my own regarding spiritual issues, is the best I can describe it.
But then one day, during a time when my Dad was in the hospital, my visiting him there, I saw a miraculous healing take place by another man that was in the next bed to him. That seemed to be in terrible pain one minute, and suddenly after this fellow came in and began ministering to him in Spanish, my not having a clue what they were saying at all. But suddenly this dude jumps out of bed, no longer in pain anymore, beginning to jump up and down saying "I am Healed" over and over again, very loudly. So loud that some nurses came running in finally to find out what all the yelling was about. He telling them the same thing, as well as saying I want to go home. The nurses telling him he will have to wait until tomorrow morning when the doctor comes in, he being the only one that can release him. anyway, the next day when we got to the hospital, he was gone. Of course, that did not cause me to become a believer about who Jesus Christ was. But certainly did have an affect on me, none the less plus finding him indeed gone, no longer laying in the bed moaning and groaning anymore.
Then the next day, while everyone was praying for and with my Dad was the thing that finally convinced me that Jesus Christ was Lord and Savior finally. Because during the time they were all praying, I was watching, even though they told every one to close there eyes then, no way was I going to close my eyes at all. And suddenly in came Jesus Christ into that room, put his hands on my dads shoulders, then left. And that was when I knew for sure who He was. And also was when I began to be determined to find out about all of this, my beginning to follow HIM. As some would say, that was the day I did an about face completely almost. Laying down from then on the cultish beliefs I had been into before. Somehow, and don't ask me how, I knew they were not the truth at all anymore. And this happened somewhere around 40 years ago, and have not turned back to follow another ever since. Didn't become perfect of course. And don't believe I am still finished by a long shot in that department either. Because if I was complete, I just don't beleive I would be here still sharing this with others today at all. But as Paul said in Phil. 3:
14: I PRESS ON TOWARD THE MARK OF THE HIGH CALLING IN CHRIST JESUS.
And about perfection, be sure and read what he said before that scripture I quoted, as well as after with understanding as to how one is not yet perfected yet, but still can be prefect at the same time. And if you don't understand, ask the Lord. And if you do not know Him, but want to, then ask HIM to reveal Himself to you in some way or another so that you can know who he is. Because as I recall back then, that was what I was asking HIM about back then. Well close anyway. Then wait for Him to answer of course. As sometimes we do have to wait, just as Is. said in Is. 40:31.