The Hebrew word for faithful is aman. It means to sustain, to support, especially to support with the arm, to carry a child. We are God's children. He cares for us. The above song is "Whom Shall I Fear?" by Chris Tomlin. It reminds me of a verse in Psalms,
"The Lord is my light and my salvation; whom shall I fear? the Lord is the strength of my life; of whom shall I be afraid?" - Psalms 27:1
This official lyric video also contains the chords for the song.