Sin is everywhere in "A Hymn to God the Father." The speaker just can't seem to get away from it, poor fella. He's preoccupied with several types of sin: Original Sin, which every human is guilty of at birth because of Adam and Eve's transgression; the sin of leading others astray; the sins that the speaker at first resists and then gives into; and the sin of fear. Man, that's a whole lotta sinning.
The speaker feels guilty about events that happened before he was even born. No wonder he's so worried all the time.
The speaker also believes that, as long as he has a relationship with God's son, he'll be forgiven of all his sins. So, he's got that going for him.
Along with his preoccupation with sins, the speaker of "A Hymn to God the Father" is pretty concerned with whether God will forgive all those sins. The speaker is of Christian tradition, which means he believes God's son died for humankind's salvation, but he still questions whether God really will let him into Heaven. He even wonders if he'll be forgiven for doubting God, since that is a sin, too. The spiritual stress seems to be piling up in layers for this poor guy.
Rather than ask for forgiveness each time, the speaker should just, you know, stop sinning.
The speaker believes that, as long as he has the son of God in his life, he'll continue to be forgiven—sweet. The questions he's asking are not as important as the conclusion he reaches.
The speaker of "A Hymn to God the Father" believes that he can't help but sin, and that even before his birth he was already guilty. He asks God to forgive him, but he also tells God that there's more sin coming. It seems that mankind has no choice but to be sinful; they can only wind up in heaven if God intervenes. It sounds like he thinks our fate is pretty much decided before we are born. Um, yay?
The speaker briefly had enough willpower to resist some of his sins, but ultimately caved in. He seems to blame human nature rather than himself for this failure of will (what a cop-out).
The speaker's salvation is entirely in God's hands. The poem shows how we puny humans are unable to determine our own fate.