This is how I became a Christian, in my own words. It's pretty much the testimony I gave when I was baptised, although I've brought it up to date a little bit.

So, to start with I ought to tell you that my parents are both Bible believing Christians, and that since I was born they have been taking me to Church and trying to show me the truth of Christianity. And when I was a child, I went along with it, and claimed to believe it all. I even went to the extent of arguing with my teachers at School because they presented non-Biblical viewpoints. I went to church happily every week, and answered all the questions at Sunday School.
    Then, when I hit my teenage years, I turned my back on everything that my parents had ever taught me. I guess it's only natural in a sense: you think you are an adult now, and you think that you don't have to listen to anything that anyone tells you anymore. For me, that meant throwing out Christianity as well. The family Bible reading turned into a daily fight as I tried to show how wrong the Bible was about absolutely everything. Some weeks, my parents had to struggle to get me into Church at all.
    Looking back on it, I can see that even at the height of my rebellion I knew I was going wrong. I knew that I needed God, but I still fought against him. By the time I was fifteen, I had painted myself into a corner. I would not back down and admit that I had been wrong all this time. I would not go crawling back to ask for forgiveness. Even though I knew I couldn't win, I wanted to go on fighting.
    If I'd been left to myself, that's where I'd still be. Defending my little corner and daring anyone to tell me I was wrong. No-one on earth could make me back down. But God could, and he did. Every week at Church I could tell God was talking to me. Every week, my resolve weakened a little. I began to read my Bible secretly, without my parents knowing. It was as if God just wouldn't let me go. 
    Eventually, I had to give way. I had to come to God and plead for forgiveness. I knew that this was something I didn't deserve. I knew that I had ignored him so many times, I half expected him to ignore me now. But he didn't.
    The feeling of forgiveness is something I can't well describe. I had expected coming to Christ to be like walking into a prison. I thought that Christians were just bound up with their rules and traditions. But when Christ came to me, I felt like I had been set free, not imprisoned. The world was altogether a more colourful place, and life was more wonderful. I couldn't help but feel happy. I knew that Jesus loved me, and had died for me.
     I know that I could never have made myself better. Nobody can, really. I suppose everyone always thought I was nice enough. I was always a 'good boy' at school. But until God acted in my life, I was a rebellious sinner, and I was destined to go to hell. It's the most amazing thing in the world to me that God chooses to take sinful people like me and call them his children. I never did anything to deserve that, and I never could do. By nature, I was fighting against my God. But God loved me even then. Jesus died for me, even then. And because of that love, and that death, I can come to God now and call him my Father.