We face battles every day of our lives. As believers, the enemy is always out to get us. He is out to make our lives not worthwhile, but the Bible says that the weapons of our warfare are not carnal but spiritual. So that means that we're not fighting a physical man or woman we're not carrying guns or bombs to fight a physical war. Now the moment you said yes to the gospel, you became an enemy to the devil. The enemy works through men to cause you to stumble or fall.
The reason why it seems li