Luke 9:62
62Jesus replied, "No one who puts his hand to the plow and looks back is fit for service in the kingdom of God."
Keep looking forward, God will do the rest. God doesn't care how much you know about the bible, or how learned you are, or what sins you have committed. He just wants you to follow him. So when someone confronts you about christianity. Tell them you follow the Christ and don't look back. God will do the rest. Luke 10:21-2221At that time Jesus, full of joy through the Holy Spirit, said, "I praise you, Father, Lord of heaven and earth, because you have hidden these things from the wise and learned, and revealed them to little children. Yes, Father, for this was your good pleasure.
22"All things have been committed to me by my Father. No one knows who the Son is except the Father, and no one knows who the Father is except the Son and those to whom the Son chooses to reveal him."