Christianity is different from religion. Religion (including Atheism) is about how you can work to become like God (or good). Christianity is about the work the God does to make us more like him. If you think you can be a good person without God, then you have no reason to believe in Jesus.
God is love. The kind of love that is self sacrificing and unselfish. He has given you a choice. You can either accept his death on the cross as payment for your sin, or you can say he doesn’t even exist. You’re still alive, because God is giving you time to turn around. When your time is up, you will have no excuse.