How to become Christian

In the VISA course, we studied about how to become Cristian. Of course, they never beg me to become Christian. We just thought about it. They taught me Christianity's "ABCD". "A" represents "admit". When they become Christian, they have to admit that they are sin, they have done something wrong, something bad. "B" means "believe". Believing Jesus is the most important for Christianity, also they said to me that believing something is very hard, and difficult for us. "C" represents "confess". Being Christian must not be secret, they have to confess that they believe in Jesus, and they admit that they are sin. "D" replaces "dead". It was the most difficult to understand for me. They have to being thinking Jesus died for our sin, and deth means to be with God.