As you have probably already found out, a Christian can sin. We aren't perfect, we are forgiven. God's plan of salvation is complete. He has made provision for us; that if we break fellowship with Him by sinning, we can be restored by the on going work of the Lord Jesus Christ; as He intercedes and represents us before the throne of God, as our High Priest and Advocate. His blood that was shed to redeemed us, has been presented before God upon the mercy seat in behalf of the Christian, for the cleansing of our sins as we confess them.

1 John 1:9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

1 John 2:1 My little children, these things I write to you, that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous.

1 John 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.

1 Timothy 2:5 For there is one God, and one mediator between God and men, the man Christ Jesus;

Sometimes after we ask God to forgive us, the enemy will fight against us with feelings of condemnation etc. A Christian must stand on God's word. Speak what the Bible says:
If I confess my sins He is faithful and just to forgive me etc. (see above 1 John1:9) If you fall down, get back up, for God is for you not against you. He gave Jesus for you, while you were a sinner, he will not throw you away now that you are His child.

How many times has your children or mine, messed up as they were growing up? Did we disown them etc. Sometimes we had to correct them, but we continued to love them.

Do you or I still remember our children's mistakes as they were growing up? Is our love for our children greater or more noble then God's love for us? He gave His only Son for us, that is how much He loves us. Would you or I give our only child for sinners?

What happens if a Christian falls into habitual sin?

Hebrews 12:5-14 And ye have forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked of him:
6. For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
7. If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
8. But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.
9. Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?
10. For they verily for a few days chastened us after their own pleasure; but he for our profit, that we might be partakers of his holiness.
11. Now no chastening for the present seemeth to be joyous, but grievous: nevertheless afterward it yieldeth the peaceable fruit of righteousness unto them which are exercised thereby.
12. Wherefore lift up the hands which hang down, and the feeble knees;
13. And make straight paths for your feet, lest that which is lame be turned out of the way; but let it rather be healed.
14. Follow peace with all men, and holiness, without which no man shall see the Lord:

In Christ's Service
E.L. Davis