Therefore we are always confident, knowing that, whilst we are at home in the body, we are absent from the Lord: (For we walk by faith, not by sight:) 2 Corinthians 5:6-7
Faith is God-centered, not man-centered. It is a gift of God, not something man produces through self-efforts of his own mind.
I am crucified with Christ, nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave Himself for me.
Faith is one of the weapons for defense against your spiritual enemy, Satan:
Satan will try to attack your faith by sending "darts" of unbelief into your mind. Having faith toward God provides a spiritual defense to these attacks.
Saving faith requires a personal response toward God. No person can respond on behalf of another.
Faith toward God, combined with true repentance, is saving faith. Salvation is knowing, believing, and personally accepting the Gospel message. Each person is saved by his own response to the Gospel.
He that believeth and is baptized shall be saved, but he that believeth not shall be damned. (Mark 16:16)