Please read Ephesians 6:16. "Besides all of this, take up the large shield of faith, with which you will be able to extinguish all the wicked one’s burning arrows."
Like the shield, or faith will only work if it is well maintained.
“Faith is the assured expectation of things hoped for, the evident demonstration of realities though not seen.” (Heb. 11:1) That is the way Paul defined faith. A Christian cannot be without faith, because “without faith it is impossible to please God well, for whoever approaches God must believe that he is* and that he becomes the rewarder of those earnestly seeking him.” (Heb. 11:6)
The disciple James showed his faith, and he pointed out that faith must be backed up with works. (Jas. 2:26 Indeed, just as the body without spirit* is dead, so also faith without works is dead.) If one believes in Jehovah God, Christ Jesus and his kingdom, then he will prove his belief by what he says, by what he does, by the way he lives.
A man’s faith can die, or become weak. Many individuals who at one time believed in Jesus Christ as the Redeemer and Saviour of mankind have fallen away. They have turned to evolution. They reject the Bible. And still, such people call themselves Christians and go to Christendom’s churches. James would say to them: “faith without works is dead..” (Jas. 2:17)
Faith is expressive. It makes proclamation. Paul said: “For with the heart one exercises faith for righteousness, but with the mouth one makes public declaration for salvation..” (Rom. 10:10) One’s faith becomes stronger when he uses his heart, mind and mouth in making a public declaration of his belief in God’s kingdom as man’s only hope.
Jesus said: “This good news of the kingdom will be preached in all the inhabited earth for a witness to all the nations, and then the end will come.” (Matt. 24:14)
This is being done today not only by a remnant of the “little flock” who have faith and whom Jesus began gathering nearly two thousand years ago, but also by a “great crowd” of people from all nations who have the same kind of faith. Because of this faith on the part of the many Christian people great works have been done in these very troublesome days.