After an attack turns him half-man half-abortion, an obstetrician uses newfound abilities to exact revenge on the attackers as his inner demon threatens to become flesh and kill him.

I'm not sure where you're getting the idea that this is some kind of anti-abortion Meredith Baxter touchie-feelie piece, but it's really not.

Regardless of your intentions, the subject of abortion is an emotional minefield. This is not a story that tip toes through a tulip field.

What is the meaning of it all? What does he come to realize by the FADE OUT about life (versus abortion), about himself that he didn't understand at the FADE IN? What do you want the audience to take away from the story? Someone once said movies are emotional delivery systems. What's the emotional experience you seek to deliver?

1) Look at the "Wordy Version" and that's the whole 'plot' (I guess), it looks like there's more to it than there is, but I'm just trying to answer questions people have had - why this, how come that, etc.

2) The demon may just be a complication, but it's part of the story, it's included so maybe somebody can help me see a way around it in order to turn this into a better performing logline.

And...

Because the demon is from his own head, a psychological side effect of his transformation, until then the demon never existed except maybe as an attachment to his own guilt as a doctor who takes lives / performs abortions.

I'm not into the whole 'Rob Zombie / the vicious killer had a traumatic childhood / a semester and a half of basic psych' thing, so emotional minefield or not, I'm not really looking to address it.

The principal structural issue I have with the logline is that it seems to have 2 inciting incidents: 1] Being boiled in the vat incites him to wreak revenge on his attackers; and 2] Killing an innocent person triggers his inner demon take revenge on him. It would seem that 2] is a 2nd act complication, but it is not the inciting incident of the story.

And why, a prolifer would want to know, didn't the demon go after the obs when he was murdering innocent unborn children? I don't which side of the abortion debate your story takes, but the subject is an emotional minefield.

Motherly Love.

What's the unifying theme?

As far as I can take your additional advice, I have but two additional attempts to address the concerns you mentioned -

The "Wordy Version":

When pro-lifers set fire to an abortion clinic, an obstetrician is unknowingly trapped inside.
As he takes refuge in an abortion disposal tank, an electrical fault activates the mechanism.
He is then transformed into part-man part-foetal matter which gives him shapeshifting powers.
Using his new abilities he begins to take revenge while visions of a mother-creature composed of his victims haunt his mind.
After he takes an innocent life, the mother-creature becomes flesh to try and destroy him.
His powers having now abandoned him, he must save the innocent life to redeem himself and save his own.

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The "Less Wordy Version":

After pro-lifers try boiling him to death in an abortion disposal unit, an obstetrician now composed of fetal remains takes his revenge using shapeshifting powers, but when he takes an innocent life, his inner demon becomes flesh to kill him.

(This version actually came first, but it really didn't answer your concerns at all.)

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Feedback appreciated, let's see what can happen from this point forward...

Very interesting concept!

Shorthand for "abortion disposal unit". Although, I could still call it that...