If Jesus is real to you, you will have an awareness of the battle.
The strategy of the enemy is to invade, lie, divide and steal. In some cultures he advances himself differently than others, but in every land he does whatever he can to divide the Brethren.
It is not possible to identify the enemy without a vital relationship with the Lord. We come under attack all the time. We don't have to give in to it. We have choice and, of course, we have all of the Armor of God.
Soldier of The Cross, one of the most important things you must determine in this life is to refrain from denigrating other Christians. Satan comes in like a storm and gets great energy when believers speak ill of one another.
God's Word commands us, warns us and implores us about this.
Be vigilant. Be prayerful. Be obedient.