Ephesians 2:8 "For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God."

Faith is like a muscle; the more you use it, the bigger it gets." (Bill Johnson)
Our faith is like the fruit of a tree; if you don't eat it, it will fall to the ground and rot. 

It is the fruit of your works, done in Jesus Christ or not in Jesus Christ, upon which we will be judged.

Psalm 62:12 “and that to you, O Lord, belongs steadfast love. For you will render to a man

according to his work”.

 Romans 2:6 “He will render to each one according to his works”

 Revelation 2:23 “I will strike her children dead. And all the churches will know that I am he who searches mind and heart, and I will give to each of you according to your works.”