Its sinful nature, so even if you are a Christian you fail/fall, what matters is if/or how you get back up. If you accept Jesus as your savior, repent for your sin thru Jesus, you will be forgiven by God and you get a helping hand from the Holy Ghost. Your Faith comes from God the Holy Ghost and is fortified thru God’s Word. God acts as the Father/Creator, Son/Jesus, and the Holy Ghost, all three are God the Lord.