It calls me to admit my sins. To be a Christian, I must acknowledge my sins. B stands for belief in the Lord Jesus Christ. I must call on him, receive him, trust him, and worship him, recognizing who he is and what he has done for me. That seals the transaction.
Faith is trust.
It's reaching out to receive Christ. So to become a Christian it doesn't matter how much faith you've got. God asks for your faith and then provides it. The faith he gives is not a blind leap into the dark. It rests on the one thing you can be sure of - God's loving faithfulness, his promise to do what he's said he would do.