Before they entered the promised land Israel was told they would do battle, but they were not to fear for the LORD would “save” them…and He did.
All of us are told in the Bible that we have another kind of enemy with whom we struggle…
“For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places.” (Ephesians 6:12)
We are still not to fear the spiritual forces of darkness for the LORD has promised to save
us...and He will.
“In the world you have tribulation, fear not for I have overcome the world…" (John 16:33)
"...put on the full armor of God…take up the shield of faith…take up the helmet of salvation and the sword of the Spirit, which is the word of God." (Ephesians 6:11-17)
"It is a trustworthy statement deserving full acceptance. For it is for this we labor and strive, because we have fixed our hope on the living God, who is the Savior of all humanity.” (1 Timothy 4:9-10)
Humanity can "take up" the shield of faith and the helmet of salvation because they are our free gifts from God.
"For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast." (Ephesians 2:8-9)