1 Corinthians 15:57 But thanks be to God, which giveth us the victory through our Lord Jesus Christ.
Romans 8:37 In all these things we are more than conquerors through him that loved us.
Jesus won the victory over the devil at the cross. Sin was atoned for, and the power of sin and death was broken.
After Jesus crucifixion and burial, He rose from the dead three days later and received victory over Satan.
Jesus resurrection from the dead broke the chains of death, set us free from sin, and neutralized the powers of evil:
Hebrews 2:14 Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil;
Hebrews 2:15 And deliver them who through fear of death were all their lifetime subject to bondage.
The way that people achieve that victory is faith.
1 John 5:4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
1 John 5:5 Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?
That doesn’t mean Christians don’t have problems, but we have God on our side, sinners, on the other hand, must go through life with no help.
God always causes us to triumph in Christ.
2 Corinthians 2:14 Now thanks be unto God, which always causeth us to triumph in Christ, and maketh manifest the savour of his knowledge by us in every place.
Romans 8:31 What shall we then say to these things? If God be for us, who can be against us?
Ephesians 6:10 Finally, my brethren, be strong in the Lord, and in the power of his might.
Ephesians 6:11 Put on the whole armour of God, that ye may be able to stand against the wiles of the devil.
Ephesians 6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
Ephesians 6:13 Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand.
Ephesians 6:14 Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;
Ephesians 6:15 And your feet shod with the preparation of the gospel of peace;
Ephesians 6:16 Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.
Ephesians 6:17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
Ephesians 6:18 Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints.