The melody of I Came To Believe by Johnny Cash runs 130 notes across 51 bars, 2:05 long in G at 104 beats per minute. The tab sits low on the neck, mostly under the fourth fret, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? I Came To Believe chords and lyrics.