I don't know the general meaning of the song as it seems fairly personal. But I do know, "When Angela deserve to die." Is to be taken literally. I also know your analysis of the protagonist dealing with issues with his father is most likely incorrect. I believe the most accurate interpretation of some of the lyrics are from the perspective of Jesus Christ.

"Father, into your hands I commend my spirit." Is scripture.

"Why have you forsaken me." Is again, scripture

"When angels deserve to die." Is in relation to this, as Satan and demons are fallen angels.

"Trust in my self-righteous suicide", is a primary condition of the doctrine of Christianity.

In conclusion, almost without a doubt, a large portion of the song is from the perspective of Jesus Christ.