Your mistakes are meaningless. Your lack of passion is unforgivable. Passion in music is what connects with peoples souls. Notes by themselves don't get it done. If you've got something in your heart that is overwhelming to you, like the mercy of God, His unconditional love, or whatever, let it come out in a way that connects with peoples souls.
Vulnerability is key.
Mistakes may happen, but nobody really cares if their soul's are being tugged at.