Satan operates mainly in the spiritual realm. He does not identify Christians by their names, the Bibles they hold, or by their dress. Identification of Christians by the Devil is done spiritually. Below I give 7 ways Satan detects Christians.
True Christians have God’s powerful Angels guarding them.
First, real Christians are not alone. They move with God’s angels.
It is written in Psalm 91:11 that:
For he will command his angels concerning you to guard you in all your ways.
Some Christians have God’s fire around them.
Secondly, real Christians have God’s fire around them. Satan and demons cannot approach such Christians.
Some Christians have very bright light around them.
Third, real Christians have a very bright light around them. Therefore, Satan and demons cannot come near such Christians. This is the same bright light that scared Saul who later became Paul.
As he neared Damascus on his journey, suddenly a light from heaven flashed around him. 4 He fell to the ground and heard a voice say to him, “Saul, Saul, why do you persecute me?”
5 “Who are you, Lord?” Saul asked.
“I am Jesus, whom you are persecuting,” he replied.
Acts 9:3-5
Some Christians have an invisible powerful hand above them.
The Word of God says in Psalm 91:1:
Whoever dwells in the shelter of the Most High will rest in the shadow of the Almighty.
Most Christians appear dressed white in the spiritual realm.
Additionally, Christians whose lives please God always appear dressed in white in the spiritual realm. This is how Satan identifies a true Christian.
Some Christians actually have Jesus Christ near them.
Also, some Christians have our Lord Jesus Christ near them. Therefore, Satan and demon cannot come near such Christians.
Some Christians are covered by the Blood of Jesus Christ.
Furthermore, some Chritians are covered by the blood of Jesus Christ. The Devil and demons will never go near such Christians.
