Based on what figleaf facade said, I think the song is either about being trapped in the sin of pornography.

Wasted, paralyzed
Beneath ten thousand layers of disguise
Built to save
What's left that has already worn away

The singer feels a paralysis of shame and guilt from lying to those close to him in order to preserve his good reputation. However, the good reputation is based on a life that feels fake or "already worn away" to him. He was living righteously, began sinning, started lying to cover it up, kept sinning, kept lying, and now feels like the righteous part of him has worn away.

Inside this vacant made-up plastic life
Only your heart survived
One last cry

The conviction is breaking him down. He feels that everything but his convictions are now just fakery. "One last cry" may imply he's crying out to God for redemption, or he's intensely shameful.

How long until (must I always remember all that I want to forget?)
It's my day (my day)
To die

His life no longer feels like living. So, he wonders when his heart will also wear away and he'll die (figuratively I think). Maybe he's also contemplating suicide. He tries to forget the images, but is again tempted into sinning again after remembering something he tried to forget.

These broken animals
Useless as they are

I think JesusIsMyDrug is right on in his explanation:
[quote]
The part that says "These broken animals useless as they are" refers to the Sacrificing of animals spoken about in the old testament, it was to atone for their sins, they would take the best animal, kill them, and burn it as an offering, this is the broken animals and he mean theyre useless because he can do that a million time to atone for his sin but still he ends up the same place again and again, in sin!
[/quote]

Gravity gets to me
Holds me here without release
Now's the time to cut the line

The intense weight of his actions is wearing on him and not letting up. "Now's the time to cut the line" could be interpreted literally or figuratively. If he's talking literally, he may be referring to the ethernet cord in the back of his computer (assuming he's talking about pornography). Cutting the cord would then sever his internet connection and remove the opportunity to sin, thereby removing the temptation. If he's speaking figuratively, he may simply wish to cut the connection between him and his sin. He speaks previously of repetition, but to beat his sin (cut the line), he'd have to decide to stop and stay dedicated to that notion.

Cross my heart
I realize nights are long and hope is gone
God help me
Make it home (this time)

"Cross my heart" seems to indicate his sincerity in the cause of beating this sexual sin. Nights are when he's most tempted and feels most lonely and hopeless. Or else, he realizes there's no hope for him to beat his sin alone and must instead cry out to God (God help me). I think "Make it home" is referring to his literal home. He gets sidetracked by his sin on the way back to his house or apartment and makes a stop at a XXX shop or strip club or something to that effect.