"For he who is least among you all--he is the greatest." (Luke 9:48)
"If you love me, you will obey what I command." (John 14:15) We truly love God when we become Christians. He commands us to live a holy life. "For God did not call us to be impure, but to live a holy life. Therefore, he who rejects this instruction does not reject man but God, who gives you his Holy Spirit." (1 Thessalonians 4:7-8) Notice he did not call us to make a holy one month, but a holy life.
Christianity is not a religion. It is a personal relationship with God, with Jesus. A relationship is a not a one day thing, it is not a one time decision. The church is Jesus's bride, a marriage requires commitment until the end of our lives.
Is being a Christian a walk or a one time decision?