I think this song is both of them singing, the man and the woman. It is part of the trilogy (I write sins, build God and then we'll talk)

Okay so

Give us this day our daily dose of faux affliction
Forgive our sins
Forged at the pulpit with forked tongues selling faux sermons.
'Cause I am a new wave gospel sharp, and you'll be thy witness

It is basically the bride and the best man pleading for forgiveness for what they did.

So gentlemen, if you're gonna preach, for God sakes preach with conviction!

^ this could be the groom saying come on tell the truth, I don't want your apology bullcrap and lies OR it could be the bride and best man saying to the groom, we would never do that, you're making up lies, if you're going to preach lies make them believable. (I think it's the second one)

Strike up the band!
Whoa-oh, the conductor is beckoning
Come congregation, let's sing it like you mean it
No. Don't you get it, don't you get it? Now don't you move.
Strike up the band!
Whoa-oh, the conductor is beckoning
Come congregation, let's sing it like you mean it
No. Don't you get it, don't you get it? Now don't you move.

Just stay where I can see you.
Douse the lights!
We sure are in for a show tonight

^ the groom is saying, tell the truth I've got you right where I want you. 'Stay where I can see you douse the lights, we sure are in for a show tonight' is saying I'm going to show everyone who you really are just you wait.'Don't you get it' is him asking the crowd why they don't believe him and If they understand where he is coming from.

In this little number we're graced by two displays of character,
We've got: the gunslinger extraordinaire walking contradictions
And I for one can see no blood from the hearts and the wrists you allegedly slit
And I for one wont stand for this if this scene were a parish you'd all be condemned.

^ saying that the bride and best man have two sides to them. But the groom isn't fooled by the tricks they have played for sympathy. Like in the past or present she might have slit her wrists or pretended to for attention. And if everyone knew what they were doing they would all be shunned apon.