"To protect us from Satan's crushing blows, Paul tells us to 'take the helmet of salvation.' ... Paul was addressing believers. Unbelievers don't have to put on spiritual armor. They aren't even in the battle. Satan doesn't attack his own forces." - pg 1089 of MacArthur Drawing Near Devotional Bible (from the Devotional)
I wanted to share this quote from my devotional Bible because it stopped me and made me think. It's referencing Ephesians 6:10-18 which is where the Armor of God is introduced.
In the quote above, the line "Satan doesn't attack his own forces," is what stopped me. Unbelievers don't need the armor of God because Satan doesn't attack unbelievers. Really? I hadn't thought about it. I assumed Satan enjoyed attacking all people. But it's true that he is against God so it makes sense that he attacks those who believe in God only. So when you become Christian and accept the Lord as your savior, you will need the Armor of God to protect you.
Here is a FREE Bible Study I found on the Armor of God if you want to learn more. There are 9 lessons so make sure you click to the next lesson after you read the first page and keep going.