Christians are at war!
Ephesians 6:10–18 explains that you are in a spiritual warfare and that it is important to wear spiritual armor.
Finally, my brethren, be strong in the Lord, and in the power of his might.
Put on the whole armour of God, that ye may be able to stand against the wiles of the devil. 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].
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. Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness; And your feet shod with the preparation of the gospel of peace; Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked. And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
The Christian’s chief enemy is that age-old Serpent, the Devil (also known as Lucifer, Diabolos, or Satan). First Peter 5:8 warns us to
Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour.
He is actively seeking to destroy his victims. In other words, as a Christian, you are a target for destruction, whether you like it or not.
One of Satan’s greatest weapons is to convince Christians that there is no danger and no enemy. If you fall for this lie, you won’t last long. Satan is real. He tempted Eve in the Garden of Eden (Genesis 3:1), and He even went after Jesus (Matthew 4:10).
He is after you too.